ASME/IEEE RVTIS Abbreviations/Definitions Version 20

ABBREVIATIONS

ABBREV. AbbreviationsDescription meaning of the abbreviationTRB indicates if the abbreviation appears in the TRB GlossaryUsage indicates the standard using the abbreviation (bold “F” indicates first usage).

Usage

ABBREV. Description TRB P16

1473

1474

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74.2

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82.1

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AAR Association of American Railroads N FAASHTO American Association of State Highway and Transportation

OfficialsN F

ACSES advanced civil speed enforcement system N F XAGT automated guideway transit Y X FAh ampere hours N F X XANSI American National Standards Institute N X F XAPI applications interface N FAPTA American Public Transportation Association (formerly

American Public Transit Association)N X F X X X X

AREMA American Railway Engineering and Maintenance of Way Association

N X F X

ASCE American Society of Civil Engineers N X X F XASME American Society of Mechanical Engineers N FASTM American Society for Testing and Materials N X F XATC automatic train control Y X X F X X XATC advanced transportation controller N FATCS advanced train control systems N FATO automatic train operation Y X X F XATP automatic train protection Y X X F X X X XATPM automatic train protection manual NATS automatic train speed N F XATS automatic train stop Y FATS automatic train supervision N X X F XAWG American Wire Gauge N FAWS auxiliary wayside system N

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Usage

ABBREV. Description TRB P16

1473

1474

.114

74.2

1475

1476

1477

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P148

214

82.1

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P154

4P1

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BC battery charger N XBTE bench test equipment N FCBTC communications-based train control N F X X XCENELEC European Committee for Electrotechnical Standardization N FCFR Code of Federal Regulations N F XDARPA Defense Advanced Research Projects Agency N FDBDD database design description N FDBMS database management system N FDMU diesel multiple unit Y X FDOT United States Department of Transportation Y F XEIA Electronics Industry Association N F X XEMC electo magnetic compatibility N XEMI electro magnetic interference N X FEMU electric multiple unit N FEN European Norm N FESD electrostatic discharge N FFFT functional fault tree N FFHWA Federal Highway Administration (of the DOT) N FFMEA failure modes and effect analysis N FFRA Federal Railroad Administration (of the DOT) Y F X X XFTA Federal Transit Administration (of the DOT) N F XFTA fault tree analysis N FGPS global positioning system N FGUI graphical user interface N FHEP head end power NHRI highway rail intersection N XHRV heavy rail vehicle N FHVAC heating, ventilating and air conditioning N FICD interface control document N FICEA Insulated Cable Engineers Association N FIEC International Electrotechnical Commission N X F X X X X X X XIEEE Institute of Electrical and Electronics Engineers N X F X X X X X X XIPC Institute of Interconnecting and Packaging Electronic

Circuits (now called Association Connecting Electronics N F

2

Usage

ABBREV. Description TRB P16

1473

1474

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74.2

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P148

214

82.1

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P154

4P1

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Industries, but continuing the use of the abbreviation)ISO International Standards Organization N X X F X XISO-OSI International Standards Organization – Open Systems

InterconnectionN F

ITE Institute of Transportation Engineers N F XITS intelligent transportation system N X FIVPS intermediate voltage power supply N FLCD liquid crystal display N X FLED light emitting diode N X F XLSB local sensor bus N FLRV light rail vehicle Y F XLSB least significant bit N FLVB local vehicle bus N FLVPS low voltage power supply N X F XMDS monitoring and diagnostic system N X FMIL military (related to US Department of Defense standards and

other documents)N F

ML multi-function-vehicle bus to local sensor bus N FMTBE mean time between event NMTBF mean time between failure N FMTBFF mean time between functional failure N FMTBHE mean time between hazardous event N F XMTTR mean time to repair N FMTTRS man time to restore service N FMU multiple unit N FMUTCD Manual of Uniform Traffic Control Devices N FMVB multi-functional vehicle bus N FNEC National Electrical Code (also known as NFPA 70) N FNEMA National Electrical Manufacturers Association N X F XNFPA National Fire Prevention Association N X FNi-Cad nickel-cadmium N FNMT network management NNOAA National Oceanic and Atmospheric Administration N FNRTL nationally recognized testing laboratory N F

3

Usage

ABBREV. Description TRB P16

1473

1474

.114

74.2

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P148

214

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NTCIP national transportation communications for intelligent transportation system (ITS) protocol

N F

O&SPA operational and support hazard analysis NOSI open system interconnect N FPCMCIA Personal Computer Memory Card International Association N FPD process data N FPDM process data marshalling N FPHA preliminary hazard analysis N FPTU portable test unit FPV presentation variables N FPWM pulse width modulation N FRF radio frequency N FRFC request for comment N FROSIN railway open system interconnection network N FRTP real time protocols NSAE Society of Automotive Engineers N X F XSCI(s) software configuration item(s) N FSCM software configuration management N FSCMP software configuration management plan N FSDD software design description N FSHA safety hazard analysis NSNVT standard network variable type N F XSOC state of charge FSPMP software project management plan N FSQA software quality assurance N FSQAP software quality assurance plan N FSRS software requirements specification N FSRTM software requirements traceability matrix N FSSHA subsystem hazard analysis N FSSIHA subsystem interface hazard analysis Y FSSn-FTA subsystem fault tree analysis N FSSPP system safety program plan NSTP software test plan N FSTPr software test procedure N F

4

Usage

ABBREV. Description TRB P16

1473

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P148

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STR software test report N FSUM software user manual N FSVD software version description N FSVP safety verification plan N FSVVP software verification and validation plan N FSVVR software verification and validation report N FTIA Telecommunications Industry Association N FTCN train communications network N F XTCP transmission control protocol N FTCRP Transportation Cooperative Research Program N FTCS train control system N FTNM train network management NTRB Transportation Research Board Y X FTWC train-to-wayside communications N FUSP user datagram protocol N FUIC Union International des Chemins de Fer NUL Underwriters Laboratory N XUNS unified numbering system (for metals and alloys) N FUTC coordinated universal time N FV & V verification and validation N FVOBC vehicle on-board (master) control N FWTB wire train bus N F X

5

DEFINITIONS

Word word being definedStatus status of definition

A - approved by ballot NA - Not applied but developed P - published in a standardDefinition meaning for the wordTRB indicates whether the word appears in the TRB Glossary

D – different M – modified N – no Y - yesUsage indicates the standard using the definition (bold “F” indicates first usage).

Usage

Word Stat

us

Definition TR

BP1

614

7314

74.1

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)

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)

Acquirer P See IEEE Dictionary. N Factual weight P The measured weight of a finished, ready-to-run vehicle;

the tare weight. Synonym: empty weight.N F

active diagnostics Diagnostics based on observed conditions and the results of commanded test routines.

N F

active grade crossing warning system

P The flashing –light signals, with or without warning gates, together with the necessary control equipment used to inform road users of the approach or presence of trains at a highway-rail grade crossing.

N F

adhesion (coefficient of) P During rolling contact, the ratio between the longitudinal tangential force at the wheel-rail/running surface interface and the normal force.

N F

advanced preemption and advance preemption time

P Notification of an approaching train is forwarded to the highway signal traffic controller unit or assembly by railroad equipment for a period of time prior to activating the railroad active warning devices. This period of time is the difference in the maximum preemption time required for highway traffic signal operation and the minimum warning time required for railroad operations and is called the advance preemption time.

N F

advanced transportation controller

P A complete electrical device mounted in a cabinet for controlling the operation of a variety of functions within the roadway subsystem as defined in the National Intelligent Transportation System Architecture Version

N F

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Usage

Word Stat

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Definition TR

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3.0.NOTE – For the purposes of this standard, a highway traffic controller shall also be considered as an advanced transportation controller.

aging factor P A quantitative factor expressing the degradation in the ability of the battery, due to usage, to deliver electrical energy under specified conditions such as, but not limited to, operating ambient temperature, cycling, depth of charge, and maintenance practices.NOTE – This is based on experience, application (cycling/float service), and charging parameters.

N F X

alertness function P A device or system that monitors the operator for signs of incapacitation, usually by requiring movement or response to take place within a prescribed period of time.

N F

ambient temperature P See IEEE Definitions. N Xanticlimber A structural member located at each end of the vehicle,

used to engage the anticlimber of an opposing or other coupled vehicle to resist relative vertical travel between the two carbodies during a collision. In articulated vehicles, the articulation system is designed to act as an anticlimber.

N F X

anti-telescoping plate A single structural member that spans the full width of the carbody at the top of the end frame, which is attached to the roof rail and the tops of the collision and corner posts, and designed to transmit the collision and corner post top reaction loads to the carbody sides.

N F

apparatus P A device or system of devices that performs a distinct function within a basic operating unit, including a device or system of devices whose principal function is data communications.

N F

apparatus interoperability

P The ability of any specific apparatus to communicate with other apparatuses in such a way that it can successfully replace another apparatus of the same apparatus type without any requirement for manual configuration other than the address or unique identifier of the replacement apparatus.

N F

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Usage

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Definition TR

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apparatus type P A pre-defined configuration that, when adhered to by a given apparatus, makes it possible for that apparatus to achieve apparatus interoperability, without restriction on the internal constructional details of the apparatus concerned.

N F

application variable See data element. N Farticulation The connection sometimes used at the center of the

vehicle or at the intermediate ends of the carbody sections.

N F

authority P A geographical or political division created specifically for the single purpose of providing transportation service.

Y F X

authority having jurisdiction

P That entity that defines the contractual (including specification) requirements for the procurement.

N X X X F X X X

authority having jurisdiction

P The entity that defines the contractual (including specification) requirements for the procurement of the highway rail interface equipment.NOTE – It is likely that there will be separate authorities having jurisdiction over the railway subsystem and the highway subsystem.

N F

automated guideway transit

P Any guided transit mode with fully automated operation (i.e. no crew on the train). The term usually refers, however, only to guided modes with small and medium-sized vehicles that operate on exclusive right-of-way.

Y F

automatic train control P The system for automatically controlling train movement, enforcing train safety, and directing train operations. ATC must include automatic train protection (ATP) and may include automatic train operation (ATO) and/or automatic train supervision (ATS).

M X X F X

automatic train operation P That subsystem within the automatic train control (ATC) system which performs any or all of the functions of speed regulation, programmed stopping, door control, performance level regulation or other functions otherwise assigned to the train operator.

M X X F X

automatic train protection

P That subsystem within the automatic train control (ATC) system which maintains fail-safe protection against

M X X F X

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Usage

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Definition TR

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collisions, excessive speed, and other hazardous conditions through a combination of train detection, train separation, and interlocking.

automatic train stop P A wayside system that works in conjunction with equipment installed on the vehicle to apply the brakes at designated restrictions or on a dispatcher’s signal, should the operator not respond properly.

M F

automatic train supervision

P That subsystem within the automatic train control (ATC) system which monitors trains, adjusts the performance of individual trains to maintain schedules, and provides data to adjust service to minimize the inconveniences otherwise caused by irregularities.Note - The ATS subsystem also typically includes automatic routing functions.

Y X X F X

auxiliary wayside system P A back-up or secondary train control system, capable of providing full or partial automatic train protection for trains not equipped with trainborne communication-based train control (CBTC) equipment, and/or trains with partially or totally inoperative trainborne CBTC equipment. The auxiliary wayside system includes trainborne equipment and may also provide broken rail detection.

N F X

available capacity A The capacity for a given discharge time and end-of-charge voltage that can be withdrawn from a cell under specific conditions of operation.

N F

basic operating unit P (A) A single vehicle designed for independent operation.(B) A permanent or semi-permanent combination,

designed for independent operation, consisting of two or more vehicles of one or more types.

D X X F X

battery duty cycle A The loads a battery is expected to supply for a specified time periods.

N F

battery tray P The supporting structure that allows two or more individual cells, or one or more multi-cell units to be mechanically configured as one assembly.

N F

battery voltage P That voltage which is provided within specified limits by the low voltage power supply (or, in its absence, the

N F

9

Usage

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Definition TR

BP1

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P155

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control voltage on-board battery).Note-Battery voltage limits are specified in IEEE Std 1476.

bench test equipment A piece of test equipment that interfaces with the monitoring and diagnostic system (MDS) to support maintenance and repair activities. It typically provides the same capability as the portable test equipment but in addition has the ability to exercise the MDS vehicle hardware interfaces in both a dynamic and static fashion.

N F

binary string A sequence of binary digits enclosed in a single quote, followed by the upper-case letter “B”, e.g., ‘1001’B.

N F

blending P The combination of two or more modes of braking (e.g. rheostatic electric brake, regenerative electric brake and friction brake) to produce the desired total retarding effort.

N F

block P See IEEE Dictionary. Mbonding P See IEEE Dictionary. N Fbrake, electric P See electric brake. Xbrake, emergency P See emergency brake. X Xbrake, friction P See friction brake. Xbrake, “panic” P See “panic” brake. Xbrake, parking P See parking brake. Xbrake, penalty P See penalty brake. Xbrake, regenerative P See regenerative brake. Xbrake, rheostatic P See rheostatic brake. Xbrake, service (maximum) P See service brake (maximum). X Xbrake, snow P See snow brake. Xbrake, straight air P See straight air brake. Xbrake, track P See track brake. Xbrakes applied P An indication that all friction brakes are applied to some

agreed upon preset level.N F

braking effort P That longitudinal retarding force generated by the friction brake system or the propulsion system (in electric brake).

N F

builder P The entity manufacturing the product. N F X

10

Usage

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Definition TR

BP1

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7314

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cab signal (system) P A signal located in the cab, indicating a condition affecting the movement of a train and used in conjunction with interlocking signals and in conjunction with or in lieu of block signals.

Y F

car P See vehicle. -- X F Xcarbody The vehicle body comprising its main load carrying

structure above all suspension units. It includes all structural articulated parts and components which are connected to this structure and contribute directly to the strength, stiffness and stability. Mechanical equipment or electrical equipment and other mounted parts are not considered part of the carbody, though their attachment brackets are. The "coupler" ends of the carbody are the outside vehicle ends which contain the means for coupling to anther vehicle. The “intermediate” ends contain the articulation system.

N F

carbody The vehicle body comprising its main load carrying structure above all truck suspension units. It includes all components which are connected to this structure and contribute directly to the strength, stiffness and stability. Mechanical and electrical equipment and other mounted parts are not considered part of the carbody, through their attachment brackets are.

N F

car builder P The entity assembling or manufacturing the vehicle. N F Xcar level diagnostics Diagnostics that include the output of functional level

diagnostic processes from more than one component on a vehicle.

F

civil speed restriction P The maximum speed authorized for each section of track, as determined primarily by the alignment, profile, and structure.

Y F

closing speed Relative speed of vehicles at instant of impact. N Fclosing speed The relative speed of the vehicle to another object or

vehicle at the time of initial impact.N F

coast P The mode of operation of a vehicle or train in which both tractive effort from the propulsion system and braking

N F

11

Usage

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Definition TR

BP1

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7514

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effort from the propulsion and friction brake systems are zero.NOTE–The inherent design characteristics of some propulsion systems will require that a negligible level of electric brake be present in the coast mode.

cock P A pneumatic device having two positions, closed/shut and open/through.

N F

collision post A set of two structural posts located at each end of the carbody, extending from the bottom of the end underframe structure up to the structural shelf. They are located at the approximate 1/3 points across the width of the vehicle, and are forward of the seating position of any passenger or crew person.

N F

collision post A set of two full height structural posts located at each end of the carbody, extending from the bottom of the end underframe structure up to the ant-telescoping plate. They are located at the approximate 1/3 points across the width of the vehicle, and are forward of the seating position of any passenger or crew person. Some customers may require additional collision posts in the operating cab end of the carbody, located inboard of the collision posts along the car longitudinal centerline, referred to as secondary collision posts.

N F

communications-based train control

P A continuous automatic train control system utilizing: high-resolution train location determination, independent of track circuits; continuous, high capacity, bi-directional train-to-wayside data communications; and trainborne and wayside processors capable of implementing vital functions.

N F X

communications-based train control user (CBTC user)

P Any authority-authorized personnel who receives information from, provides information to, or performs repair or maintenance on, a CBTC system.

N F

communications-based train control (CBTC) user interface

P That portion of the human computer interface in which the CBTC user interacts with the CBTC system to observe and/or perform functions implemented by the CBTC system. Includes, but not limited to, displays,

N F

12

Usage

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Definition TR

BP1

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)

audible indicators, tactile entries, cursor positioning device implementations, and voice input devices.

communications-based train control (CBTC) user profiles

P A definition of the vision, hearing, language and physical characteristics of the CBTC user.

N F

commuter rail P A passenger railroad service that operates within metropolitan areas on trackage that usually is part of the general railroad system. The operations, primarily for commuters, are generally run as part of a regional system that is publicly owned or by a railroad company as part of its overall service.

Y F

component An identifiable element within the vehicle or vehicle sub-system to which a condition may be applied.

N F

concept level P The level of verification activities at which vital functions and vital implementation requirements, imposed on the system’s design and implementation by the safety assurance concept selected, are determined and identified.

N F

condition A description of the state of a component developed from an interpretation of the values of the statuses and/or parameters associated with it or influenced by it.

N F

consist P The makeup or composition (number and specific identity) of individuals units of a train.

D X F X

consist The makeup or composition of the individual nits of a train, generally by number of, and type, of vehicle.

N F

constant current loads P A load that demands constant current even current when the input voltage varies.Note – Typical of such loads is lighting when driven from an inverter ballast configuration.

N F X

constant power load P A load that demands a constant power from the source even when the voltage value drops such as when switching from the low voltage power supply to the battery.Note – Typical of such loads that have their own built in regulator such as propulsion control voltage supplies.

N F X

continuous train control NA A locomotive or self-propelled car apparatus that is M

13

Usage

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Definition TR

BP1

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7314

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system constantly in contact with wayside control apparatus and is immediately responsive to a change of conditions in the controlling section that affects train movement.

controls An active processing of commands or inputs relaying a request to a subsystem for action.

N F

control action P A request by the communication based train control (CBTC) user for the CBTC system to perform an operation. A control action may require a single user input, or a sequence of user inputs, and a user requested control action may be subject to verification checks prior to the CBTC system performing the requested operation.

N F

control voltage P Voltage that is provided for operating the controlling elements of the train. See: battery voltage.NOTE-This may or may not be the same potential value as the battery voltage.

N F

controller assembly P A complete electrical device mounted in a cabinet for controlling the operation of a highway traffic signal installation.

N F

corner post A set of two full height structural posts located at the outside corners of the passenger compartment or near the extreme corner of the carbody, extending from the bottom of the underframe structure up to the roof at the top of the side frame at its intersection with the roof.

N F

corner post A set of two full height structural posts located at the outside corners of the passenger compartment or at the extreme corner of the carbody, extending from the bottom of the underframe structure up to an anti-telescoping plate to the roof at the side frame at its intersection with the roof. Some customers may require additional corner posts in the operating cab end of the carbody, located on the side of the carbody inboard of the corner referred to as secondary corner posts (sometimes identified as side collision posts).

N F

corona effect P See IEEE Dictionary. N Fcoupler interface P That facility of an basic operating unit that is designed to

provide convenient connection to, and disconnection N F

14

Usage

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Definition TR

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from, any other basic operating unit without requiring disassembly of any constituent part of either basic operating unit. This includes standardized mechanical, electrical, electronic, pneumatic, and other interfaces as required.

crash energy management

A method of design and manufacture of vehicle structures that assigns certain sections, or zones, of the carbody the task of absorbing a portion of the energy of collision by crushing in a controlled manner (see “structural energy absorption zone”). The controlled crushing and energy absorption functions are typically assigned to special carbody structural members in the structural energy absorption zone that are designed to crush in a predictable, stable manner, over a distance that depends on the design of the member, and the desired amount of energy absorption. The Customer may specify, in addition, the use of supplementary energy absorbing structure and/or testing requirements.

N F X

crashworthiness The ability of a vehicle to manage the energy of a collision while maintaining structural integrity, so as to minimize injury to occupants, other vehicles and pedestrians.

N F

crashworthiness The ability of a carbody to manage the energy of a collision while maintaining structural integrity, so as to minimize injury to occupants.

N F

creepage P See IEEE Dictionary. N Fcrossing P See highway-rail grade crossing. N Fcrush loaded weight P The weight of a vehicle when loaded with crew, all seats

occupied, and standees to a specified maximum number.N F

customer The organization that establishes the rail transit system design criteria and technical requirements for the vehicle.

N F X

cut out P The state of being disabled by the conscious use of a cutout device or function.

N F

cutout P A device or function whose purpose is deliberately to disable a specified device or function, e.g. “dynamic

N F

15

Usage

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Definition TR

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brake cutout.”data element An atomic unit of digital information used by one or

more systems on one or more rail vehicles for control, status reporting, monitoring, diagnosis, or communication. Also referred to as an application variable.

N F

data recorder P The device used to record any type of data N Fdata recording P The act of to recording any type of data. N Fdeadman P A pressure or activity actuated alertness device to detect

inattention or disability of a train operator.NOTE-The deadman can be contained within the master controller main handle grip, obtained by a separate foot switch, or obtained through an alertness type function. The device, when not properly maintained in an operational condition, will result in an emergency or full service brake application.

D F

dead time P See IEEE Dictionary. N Xderail detector P A device so arranged as to detect a derailment condition. N Fdesigner The contractor who has the contractual responsibility to

design, manufacture, test and certify ready for service the vehicle to satisfy the system design criteria and the vehicle specification of the Operator

N F

diagnostics The processing of status and parameter information to produce a description of the condition of a component of the vehicle or that of one of its sub-system.

N F

diagnostic test equipment A collective term that encompasses portable test equipment and bench test equipment.

N F

display P A visual representation of data, graphics or text that is presented on a screen.

N F

display screen P The surface of the display device on which the visual representation of data is presented.

N F

discrete status or parameter

The smallest unit of measurement that can be associated with a particular condition or state in the vehicle. A condition or state that has a definitive meaning within the context it is being evaluated but may require comparison

N F

16

Usage

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Definition TR

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to other status or parameter values to qualify or clarify its interpretation.

doors closed P A state, as given by trainline signal indication, in which doors are fully closed and locked.

N F

doors locked P The condition reached in the door-closing cycle when the drive has achieved a latching condition that will hold doors closed mechanically until a door-opening cycle is initiated.

N F

doors open P A state, as given by trainline signal indication, in which doors are not fully closed and locked.

N F

dwell time P The time a transit unit (vehicle or train) spends at a station or stop, measured as the interval between its stopping and starting.

Y F

E-telegram A non-deterministic, event driven network message.NOTE – The message is in accordance with UIC 556.

N F

electric brake P A mode of operation of the propulsion system in which retarding is provided.NOTE–Although generally considered synonymous with dynamic brake, electric brake is a more global term, in that it includes the possibility of providing retardation by drawing power from the line or other means not dependent on conversion of kinetic energy into retarding power, which is the key element of dynamic braking.

D F

electric coupler P A device used to allow trainline signals to be transmitted from vehicle to vehicle or unit to unit in a train, with the connection of trainlines performed automatically when vehicles are coupled.

D F

emergency brake P Fail-safe, open-loop braking to a complete stop with an assured maximum stopping distance considering all relevant factors. Once the brake application is initiated, it is irretrievable, i.e. it cannot be released until the train has stopped or a predetermined time has passed.

M X F

empty weight P See actual weight. Y Fend compression load (buff load)

Compressive (longitudinal) force applied at the ends of the vehicle, usually at the anticlimber or the articulation,

N F

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unless specifically stated otherwise by the customer.end frame At the coupler end, the end frame consist of corner posts

at the juncture of the front end and side frame, stub collision posts located at the approximate third point of the end frame width, the end structural shelf or transverse beam, and sheet metal sheathing connected to the structural framing members. At the intermediate end, the end frame contains the articulation means with provision for anticlimbing.

N F

end sill compression load (buff load)

Compressive force applied at the ends of the car, usually at the anticlimber.

N F

end sill compression load (buff load)

Compressive (longitudinal) force applied at the ends of the vehicle, usually at the anticlimber, unless specifically stated otherwise by the customer.

N F

entrance gate P A highway rail crossing warning gate used on the approach lanes of traffic toward a highway-rail grade crossing.

N F

ergonomics The interdisplinary science that studies the relationships between people and their environment.

N F

event A change in the value of a sample that is deemed significant.

F

event data record A set of samples that have been segregated from a sampled data set on the basis of their being deemed as representing events. Each sample will normally have supplementary information such as time, position, etc. associated with it.

N F

event recorder P An on-board device/system with crashworthy nonvolatile memory which records data to support accident/incident analysis.

N F X X

exit gate P A highway rail crossing warning gate used on the exit lanes of traffic from a highway-rail grade crossing.

N F

fade P (A) The condition occurring during a braking cycle at low speed wherein the fundamental characteristics of the propulsion system utilized will not support the power requirement of the level of dynamic electric brake called

N F

18

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for. Consequently, the level of dynamic electric brake actually generated decreases as a function of speed along an inherent characteristic.(B) In electric braking systems capable of supporting the level called for to zero speed, a deliberately-created characteristic wherein the level of electric brake decreases as a function of speed to allow a smooth transition to friction brake for the purpose of the final stop.

failure A partial or complete loss in functionality of a component of the vehicle or one of its subsystems resulting in equipment being unable to perform some or all of its intended function.

Note: Failures can be major, where total loss of equipment capability results, or minor, where equipment remains operable but with reduced capability or where the failure is resettable. Failures can occur in equipment, which is being observed by the monitoring and diagnostic (MDS) system, termed equipment failure, or in some element of the MDS itself, termed MDS failure. MDS failures can be further divided into two categories: monitoring failures and diagnostic failures. Monitoring failures can be divided into FRA monitoring failures, where a failure to record an FRA-required parameter has occurred (where FRA requirements apply) or, diagnostic monitoring failures, where a failure to record a non-FRA required parameter has occurred.

N F

fail-safe P A design philosophy applied to safety-critical systems such that the result of a hardware failure or the effect of software error shall either prohibit the system from assuming or maintaining an unsafe state, or shall cause the system to assume a state known to be safe.

Y X F X X

fail-safely P The implementation of a function in a fail-safe manner. N F Xfault A condition, or combination of conditions, that fall

outside the bounds of normal or expected behavior N F

19

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patterns within the vehicle or one of its sub-systems.fault tree analysis (FTA) P A structured analysis method used to comprehensively

identify faults and combinations of faults of software and hardware components as they relate to a hazard.

N F

forward P The direction of motion of the train corresponding to the direction of vision of an operator or attendant when occupying his or her normal position in a normal orientation.NOTE-For an unattended vehicle, forward may be defined by the prevailing direction of operation on the guideway segment being utilized.

N F

friction brake P The system of pneumatic, electropneumatic, hydraulic, electrohydraulic, or electric valves, controls, actuators and associated components which, in combination, provide the capability of braking the car to a stop purely by the action of friction devices upon the wheel tread, disc rotors, or other surfaces.

D F

full field P In a propulsion system, the motor connection in which, for series motors, the exciting field current is the same as the armature current, or, for separately excited motors, the exciting field current is at its maximum value relative to the armature current.

N F

fully charged capacity A State of the battery charge following a constant current charge. Considered to be 100% state of charge of the new battery.NOTE – Constant current charge in accordance with IEC 60623.

N F

function level diagnostics Diagnostics that focus on the function of a specific component.

N

function key P Assignable special purpose keys on a computer keyboard or keypad, which the communications-based train control (CBTC) user employs to interact with the CBTC system.

N F X

functional fault tree (FFT)

P A structured fault tree analysis method used to identify vital functions at the system functional level by comprehensively examining system functional faults, which could precipitate hazards.

N F

20

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functional level P The level of verification activities at which vital system functions are identified from system functional and operational requirements.

N F

galvanic isolation P A method of electrical isolation where neither the signal nor the common of the output of the isolator is dc coupled to the signal or common of the input of the isolator, except for low level leakage associated with non-ideal components.

N F X

gap P See IEEE Dictionary. N Fgate down P A crossing gate is in the down position when it is some pre-

determined number of degrees from vertical (typically 85 to 92 degrees depending on the specific gate mechanism adjustment).

N F

gate up P A crossing gate is in the up position when it is some pre-determined number of degrees from horizontal (typically 85 to 92 degrees depending on the specific gate mechanism adjustment).

N F

global level diagnostics Diagnostics that include the output of train level diagnostic processes from more than one train.

N F

grounding P See IEEE Dictionary. N Fhardware failure P A change in the characteristics of a system hardware

element beyond its design tolerances.N F

hazard P An existing or potential condition that can result in a mishap.

N X F

head end power NA Train-lined auxiliary power provided from a locomotive to other cars in the train.

N

headway P The time interval between the passing of the front ends of successive vehicles or trains moving along the same lane or track in the same direction.

Y F

health P Summary information regarding the current ability of a system or subsystem to perform its intended function.

N X F

heating ventilation and air conditioning (HVAC) compressor pull down

P The condition wherein the air conditioning system in the car is turned on and is required to cool a car that has been sitting in the heat of the day.NOTE – This condition usually presents the highest/longest

N F

21

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sustained power demands to the auxiliary inverter.heavy rail transit P A mode of rail rapid transit generally characterized by

fully grade-separated construction, operating on exclusive rights of way, and station platforms at the floor level of the vehicles.

D X F X

heavy rail vehicle P A vehicle operating on a heavy rail transit system. Typically, electrically propelled, bi-directional, capable of operating in multiple unit, and designed for rapid, high-level boarding and discharging of passengers.

N F X

heavy rail transit vehicle A typically electrically propelled, bi-directional vehicle, capable of operating in multiple units, and designed for rapid, high-level boarding and discharging of passengers. The vehicle is operated on a mode of rail rapid transit generally characterized by fully grade-separated construction on exclusive right of way, with station platforms at the floor level of the vehicles. These systems are commonly referred to s subways or metros.

N F

hexadecimal string A sequence of hexadecimal digits enclosed in a single quotes, followed by the upper case letter “H”, e.g., ‘F0A3’H.

N F

high discharge rate (H) P Typically for discharges above 3.5C5A up to 7C5A.NOTE – The discharge rate is in accordance with IEC 60623 (2001-09).

N F

highway, road, or street P General terms denoting a public way for purposes of travel, including the entire area within the right-of-way.

N F

highway-rail grade crossing

P A location where a public highway, road, street or private roadway, including associated sidewalks and pathways, crosses a highway and railroad’s right-of-way cross at the same level, within which are included railroad tracks, highway, and traffic control devices for highway traffic traversing the that area. For the purpose of this standard, a crossing is the intersection of a highway and up to 8 tracks controlled by a single independent warning system.

N F

highway rail intersection P See highway-rail grade crossing. N Fhighway traffic signal P A power-operated traffic control device by which traffic is N F

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warned or directed to take some specific action. These devices do not include power-operated signs, illuminated pavement markers, barricade warning signals, or steady burning electric lamps.

highway traffic signal controller

P A complete electrical device mounted in a cabinet for controlling the operation of a highway traffic signal installation.

N F

human computer interface

P The set of stimuli that a user experiences when in and around a computer terminal including but not limited to a user interface, the work area furnishings and environmental elements consisting of bio-mechanical stresses, light, sound, temperature, and air quality.

N F

implementation level P The level of verification at which system components implementing vital functions are comprehensively identified and analyzed to verify that all functions identified as vital are implemented fail-safely.

N F

independent operation P The ability, when supplied with appropriate energy, and with control signals from internal sources or through one or more coupler interfaces, to perform all of the functions of which the installed equipment is intended to be capable.

N F

input Status or parameter that is input to the monitoring and diagnostic system (MDS) from the vehicle, one if its subsystems or wayside via an IEEE Std 1473 compliant network connection or is acquired directly by the MDS through a dedicated hardware interface.

N F

interconnection P The electrical connection between the railroad active warning system and the traffic signal controller assembly for the purpose of preemption.

N F

interconnection circuit P A control circuit using a closed-circuit principle. Referenced in the Manual on Uniform Traffic Control Devices as a “supervised circuit” activated by a train approaching a highway-rail grade crossing which preempts the operation of a highway traffic signal controller.

N F

interface P The points where two or more physical systems or N F X23

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subsystems meet to transfer energy or information.interlocking P An arrangement of switch, lock and signal devices that is

located where rail tracks cross, join, separate, and so on. The devices are interconnected in such a way that their movements must succeed each other in a predefined order, thereby preventing opposing or conflicting train movements.

Y F

intermediate-voltage power supply (IVPS)

P Power supply that converts the third rail or catenary high voltage dc or ac into an intermediate voltage dc or ac to feed other power supplies.

N F

island P That portion of the highway-rail grade crossing where the highway directly crosses the railroad tracks.

N F

island occupancy P For detection purposes, a train is said to be occupying the island when it is a minimum of 20 feet and a maximum of 100 feet from either edge of where the highway crosses the tracks.

N F

lay-up condition P Idle condition of the equipment and systems between service operations.

N F

liquid crystal display P A display made of material whose reflectance or transmittance changes when an electric field is applied.

N F

light-emitting diode P A p-n junction solid-state diode, whose radiated output is a function of its physical construction, material used and exciting current. The output may be in the infrared or in the visible region. When used as a visible element, the output shall be limited to the visible region.

N F

light rail transit P A mode of rail transit characterized by its ability to operate on exclusive rights-of-way, street running, center reservation running, and grade crossings and to board and discharge passengers at track or vehicle floor level.

Y X F X

light rail vehicle P A vehicle that operates on a light rail transit system, capable of boarding and discharging passengers at track or vehicle floor level.

Y F X

light rail vehicle This standard establishes the following two categories of light rail vehicles for the customer selection:Category I: Streetcars – Light rail street cars operate

M F

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mainly at street level (with some sections in tunnels or on rights-of-ways) in consists of normally single or up to two units per train and at lower speeds than for rail transit vehicles.Category II: Light Rail Transit Vehicles (LRTVs) – LRTVs operate on a light rail transit system and are capable of boarding and discharging passengers at track or vehicle floor level. The light rail vehicle provides a mode of rail transit characterized by its ability to operate exclusive rights-of-ways, street running, center reservation running, and grade crossings and to board or discharge passengers at track, vehicle floor, curb or street levels.

liquid crystal display P See IEEE Dictionary. N Xload shedding P See IEEE Dictionary. N Xload weighing P A function incorporated in the propulsion or friction

brake system which measures changes in sprung vehicle weight. Its purpose is to permit control of tractive effort in order to achieve a constant effort-to-weight ratio for a given master control command.

N F

locked rotor current P See IEEE Dictionary. Nlog The log is the set of all event data records, sampled data

records and processed data records retained within the monitoring and diagnostic system (MDS) or in a sub-system connected to the MDS. It is normally retained within some form of non-volatile memory or removable storage medium.

N F

logged data A subset of the contents of the log referenced by some association such as time, position of vehicle, etc.

N F

low discharge rate (L) Typically for discharges up to 0.5C5A.NOTE – The discharge rate is in accordance with IEC 60623 (2001-09).

N F

low-voltage power supply (LVPS)

P A power supply that provides dc power to the low-voltage devices or circuits contained on the vehicle. It can also be configured to charge the vehicle battery.

N F

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manufacturer P See: builder N F Xmanufacturer The organization who has contractual responsibility to

design, manufacture, test and certify that the vehicle is ready for revenue service, and complies with the system design criteria and the technical specification provided by the customer.

N F X

master control P The train-borne device or system directly providing the control signals to the train.

N X F

master controller P A physical device utilized by a human operator to provide the master control of a train.

N F

mean time between hazardous events (MTBHE)

P Where hazardous events and the equipment, which may precipitate them are defined at the system level. The hazardous events included in MTBHE are those whose consequences are of a given severity, as determined by the organization generating the safety goals.

N F

medium discharge rate (M)

P Typically for discharges above 0.5C5A up to 3.5C5A.NOTE – The discharge rate is in accordance with IEC 60623 (2001-09).

N F

minimum yield strength A value for a material as published by American Society for Testing of Materials (ASTM) for the specified material and grade. If the material used is not covered by an ASTM specification, or another specification approved by the customer, the minimum yield strength shall be as guaranteed by the material supplier.

N F X

mishap P An unplanned event or series of events resulting in death, injury, occupational illness, or damage to or loss of equipment or property, or damage to the environment; an accident.

N F

monitoring The process of collecting status and parameter values from the vehicle and its sub-systems.

N F

monitoring interconnected operation

An interconnected operation that has the capability to be monitored by the railroad and/or highway authority at a location away from the highway-rail grade crossing.

N F

movement authority P The authority for a train to enter and travel trough a specific section of track, in a given direction. Movement

N F

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authorities are assigned, supervised, and enforced by a communications-based train control system to maintain safe train separation, and to provide protection through interlockings.

multi-cell unit P Two or more battery cells permanently connected. N Fmultiple unit P A system of simultaneous control of all vehicles in a

consist from one master control through the means of trainlines.

D F

network communication timing

P See IEEE Dictionary. N X

no motion P A safety-critical function utilized to indicate that the train is at zero speed or sufficiently close to zero speed. Used to inhibit the ability of the doors to open when the train is moving, and can be used for functions such as emergency brake reset, that may require an indication of the no motion condition.

N F

on-board database The logged data contained in the logs of the monitoring and diagnostic system (MDS), other vehicle sub-systems, and the MDS’s and sub-systems of other vehicles that are available to the MDS via the vehicle and train networks.

N F

operational status NA Summary information regarding the current ability of a system or subsystem to perform its intended function.

N

operator The organization which establishes the rail transit system design criteria and technical requirements for the vehicle it intends to operate on its system.

N F

output Status or parameter that is output from the monitoring and diagnostic system (MDS) to the vehicle, one of its sub-systems or wayside vi an IEEE Std 1473 compliant network connection or is asserted directly by the MDS through dedicated hardware interface.

N F

parameter Condition or state within the vehicle that is continuously variable across a range of values.

N F

“panic” brake P Using any available form of braking, whether or not fail-safe, to obtain the shortest possible stopping distance.

N F

parallel P In a propulsion system, the motor circuit in which the N F

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final parallel or series-parallel motor connection is achieved and the maximum voltage available per motor is applied.

parking brake P A means that supplies static braking forces to maintain a vehicle or train in a no motion state.

N F

passenger information sign

P A device that displays, annunciates or communicates transit trip information to passengers.

N F

passenger weight The weight of each crewmember and passenger as used in the calculation of the vehicle loads shall be 75 kg (165 lb) nominal. The customer may specify a higher passenger weight for specific operating conditions such as service to airports and use of luggage racks.

N F

passenger weight The weight of each crewmember and passenger as used in the calculation of the vehicle loads shall be 70 kg (174 lb) nominal. The customer may specify a higher passenger weight based upon specific service conditions such as service to airports and use of luggage racks.

N F

passive diagnostics P Diagnostics based on observed conditions. Fpenalty brake P A function of the automatic train protection portion of

the master control system, accomplished by a safety critical full-service or emergency brake application.NOTE-Although most commonly associated with an overspeed operating condition, penalty brake initiated for a variety of reasons, depending on the vehicle design and the requirements of the authority having jurisdiction.

N F

penalty overspeed condition

P A condition requiring the application of the penalty brake by the automatic train protection subsystem in order to assure safe train operation

N F

performance evaluation The technical assessment of a system or system component to determine how effectively operating objectives have been achieved.

N F

period A An interval of time in the battery duty cycle during which the load is assumed to be constant for purposes of cell sizing calculations.

N F

permanent deformation A condition resulting from a stress greater than the N F X

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minimum yield strength of the material, or where the material has deformed to the extent that it will not return to its original shape or position after the load is released.

Personal Computer Memory Card International Association

NA An association to standardize methods for connecting peripherals to portable computers.

N

physical type A primitive data type with associated physical metadata. N Fpneumatic brake pipe P A pressurized air line, continuous over the length of the

train, used variously to indicate train integrity, provide indication of an emergency condition, equalize reservoir pressures, or propagate a brake application signal.

N F

portable test equipment A man portable piece of test equipment that connects to the monitoring and diagnostic system (MDS) and provides access to its internal functions. It is typically a laptop computer equipped with software that supports monitoring the operation of the MDS, downloading of logged data, uploading configuration and control files, etc.

N F

power “knock out” P A function, derived from friction brakes being applied above a low preset level on any truck that removes propulsion power on every vehicle in the train.

N F

preemption P The transfer of normal operation of traffic signals to a special mode.

N F

preemption design time P Design time for highway traffic signal preemption. Equal to the sum of the minimum warning time and advance preemption time.NOTE – Advance preemption time may be zero (see simultaneous preemption).

N F

preemption warning active

P Preemption warning active occurs when the rain is within the preemption design time.

N F

primitive type Lowest level of defined data type from which all other data types are defined.

N F

process data marshalling (PDM)

A software function responsible for the following tasks: Process variable mapping between data structures on

the train bus and the vehicle bus.

N F

29

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Data structure transformation Other processing data (e.g., combinational logic) for

import to the vehicle bus or export to the train bus. Buffering and scheduling of data structure transfers

between the train bus and the vehicle bus.process variable A data element used for control or supervision of one or

more processes on one or more rail vehicles. Also, see data element.

N F

processed data record A set of values summarized or representing the condition or state if the vehicle that has generated by processing the contents of sample data records and event data records.

N F

propulsion system P The system of motors, drive mechanisms, controls, and other devices that propels or retards a vehicle.

M F

purchaser P The entity that contractually acts as the customer. N FR-telegram A deterministic, periodic network message.

NOTE – The message is in accordance with UIC 556.F

rated capacity (nickel-cadmium cell)

A The capacity assigned to a nickel-cadmium cell by its manufacturer for a specific constant current discharge, with a given discharge time, t a specified electrolyte temperature, to a given end-of-discharge voltage. The conditions used to establish rated capacity are based on a constant current charge.NOTE – Constant current charge in accordance with IEC 60623.

N F

rating, declared A A rating stated by a supplier for a given piece of equipment, representing the characteristics for a defined period of time will not damage the apparatus.

N F

rating, published A A rating publicly stated by a supplier for a commercially available piece of equipment, independent of the use of that equipment in a particular application; typically, rating embodied in documents prepared for broad distribution through commercial channels.

N F

rating, specified A A rating that a given piece of equipment is required to be capable of achieving fro use in a particular application; often, in practice, a rating to which a piece of equipment

N F

30

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is specially designed or adapted.reaction time P See IEEE Dictionary. N Xredundancy P The existence in a system of more than one means of

accomplishing a given function.Y X F

regenerative brake P A form of dynamic brake in which the electrical energy generated by braking is returned to the power supply line, provided to on-board loads, or a combination thereof during the braking cycle instead of being dissipated in resistors.

M F

reliability P The probability that a system will perform its intended functions without failure, within design parameters, under specific operating conditions, and for a specific period of time.NOTE-The ambient environmental conditions for operation are specified by the authority having jurisdiction, or, in the absence of such specifications, by IEEE P1478/D4.0.

M X F

remanufactured (vehicle) NA A vehicle that, in order to extend its service life, has been structurally restored and had installed new or remanufactured components totaling a cost of 60% or more of then-prevailing vehicle replacement costs.NOTE-The act of rebuilding or remanufacturing is to be interpreted as a major rehabilitation, tantamount, in certain regulatory contexts, to building anew. It should not be confused with overhaul, which is to be interpreted as a scheduled maintenance action implicit in the defined service life of the vehicle.

resistive loads P Loads for which the current supplied by the low voltage power supply/battery varies proportionally to the source voltage.NOTE – These loads will demand less current when the source voltage is switched from the low voltage power supply to the battery. Typically, relays fall into this category.

N F X

response time P See IEEE Dictionary. Nreverse P The direction of operation that is opposite to forward. N F

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-2 (P

)

reverser P (A) The portion of the master controller used to change the commanded direction of train movement.(B) A circuit device used to change motor connections in order to change the direction of motor rotation and thus train movement.

N F

rheostatic brake P A form of dynamic brake in which the electrical energy generated by braking is dissipated as heat in on-board resistors during the braking cycle.

N F

roadway-rail intersection P See highway-rail grade crossing. N Fsafe P Having acceptable risk of the occurrence of a hazard. N F Xsafe braking model P An analytical representation of a train’s performance

while decelerating to a complete stop, allowing for a combination of worst-case influencing factors and failure scenarios. A communication-based train control equipped train will stop in a distance equal to or less than that guaranteed by the safe braking model.

N F

safety NA Freedom from those conditions that can cause death, injury, occupational illness, or damage to or loss of equipment or property, or damage to the environment.

N

safety assurance P A characteristic of the implementation of a system that assures a level of safe operation.

N F X

safety assurance concept P A design concept applied to processor-based systems that assures the fail-safe implementation of identified functions, including safe operation in the presence of hardware failures and/or software errors. Examples are: Checked Redundancy; Diversity and Self-Checking; Numerical Assurance; and N-Version Programming.

N F

safety critical P A term applied to a system or function, the correct performance of which is critical to safety of personnel and/or equipment. A term applied to a system of function, the incorrect performance of which may result in an unacceptable risk of a hazard. See also: fail-safe.NOTE-A safety-critical designation may require the incorporation of additional special safety design features.NOTE-Vital functions are a subset of safety-critical functions.

N X X F X X

32

Usage

Word Stat

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Definition TR

BP1

614

7314

74.1

1474

.214

7514

7614

7714

78P1

482

1482

.114

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36P1

544

P155

8

P156

8

1570

P158

2

P162

0

RT

-1 (P

)

RT

-2 (P

)

safety validation P A structured and managed set of activities that demonstrate that the system, as specified and implemented, performs the intended functions and that those functions result in overall safe operation. Validation answers the question, “Did we build the right system?”

N F

safety verification P A structured and managed set of activities that identify the vital functions required to be performed by the system, and demonstrate that the system, including its subsystems, interfaces and components, implements the vital functions fail-safely to a level that meets the allocated system safety goals. Verification answers the question, “Did we build the system right?”

N F

sample The value of a status or parameter at a known instant of time.

N F

sampled data record A set of samples that has not been processed or otherwise refined. The set of samples will normally have supplementary information, such as the start time and sample rate, associated with it.

N F

sampling rate P The frequency with which the event recorder regularly monitors an input channel to determine its value.

N F

sampling rate The rate that the monitoring and diagnostic system obtains samples.

N F

sanding P Dropping or blowing of sand or similar material on the top of the rail head to increase the coefficient of friction to obtain better adhesion.

N F

screen P See IEEE Dictionary. N Fself-revealing component failures

P Component failures whose effects on system operation are immediately and clearly apparent to a properly trained person.

N F

series P In a propulsion system, the motor connection in which all motors are connected in series for the purpose of supplying them with some fraction (usually one-half) of the available voltage.

N F

service P The operation of the vehicles under normal conditions D F

33

Usage

Word Stat

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Definition TR

BP1

614

7314

74.1

1474

.214

7514

7614

7714

78P1

482

1482

.114

8315

36P1

544

P155

8

P156

8

1570

P158

2

P162

0

RT

-1 (P

)

RT

-2 (P

)

with or without revenue passengers.service braking (maximum)

P A non-emergency brake application that obtains the (maximum) brake rate that is consistent with the design of the brake system, retrievable under the control of master control.

M X F

service revenue P (A) Transit service excluding deadheading or layovers.(B) Any service scheduled for passenger trips.

Y F

sheathing The parts, if any, of the exterior covering of the carbody that are used as a structural component of the vehicle and included in its stress analysis.

N F X

short-time operating voltage

A A supply voltage, other than the continuous operating voltage range, operation at which for a defined period of time will not damage the apparatus.

N F

simultaneous preemption P Notification of an approaching train is forwarded to the highway traffic signal controller unit or assembly and the railroad active warning devices at the same time.

N F

slide, wheel P See wheel slide. Xslip, wheel P See wheel slip. Xsnow brake P A constant application of light friction brake intended to

create enough heat to mitigate the buildup of snow and ice, which would interfere with the brake actuators.

N F

software error P An error in a system software element which, when executed, results in unintended system operation.

N F

software integrity level A A denotation of a range of values of a property of an item necessary to maintain system risks within acceptable limits. For items that perform mitigating functions, the property is the reliability with which the item must perform the mitigating function. For items whose failure can lead to a threat, the property is the limit on the frequency of that failure.

N F

spin, wheel P See wheel spin.state See condition. N Fstate-of-charge factor P Actual capacity of a battery expressed as a percentage of

a fully charged.NOTE – This is based on experience, application

N F

34

Usage

Word Stat

us

Definition TR

BP1

614

7314

74.1

1474

.214

7514

7614

7714

78P1

482

1482

.114

8315

36P1

544

P155

8

P156

8

1570

P158

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P162

0

RT

-1 (P

)

RT

-2 (P

)

(cycling/float service), and charging parameters.status Condition or state within the vehicle that can be

represented by a single binary symbol, i.e., on-off, closed/open, motion/no motion, etc.

N F

step signal P See IEEE Dictionary. Nstorage rate P The frequency with which sampled signals are recorded

in crashworthy non-volatile memory. The event recorder may store any signal less often than it samples.

N F

straight air brake P An arrangement of brakes whereby air is admitted from the main reservoir through a brake valve to the straight air pipe to the brake cylinders in the operating unit.NOTE-In most rail transit vehicle applications, an electro-pneumatic overlay is utilized to assist in the straight air brake command transmission.

N F

straight air pipe P A method of transmitting a pneumatic command from the active cab to the straight air brake equipment on each vehicle in the operating unit.

N F

stroke width P In character recognition, the distance between two stroke edges, measured perpendicular to the stroke centerline.

N F

structural energy absorption zone

A zone, typically located at the coupler ends of the carbody, where controlled deformation or crush is allowed to occur when the carbody is loaded beyond its elastic capacity, while the integrity of the remaining carbody is maintained.

N F X

structural shelf The structural member in the end frame that spans the full width of the carbody and is attached to the tops of the collision posts and to the corner posts, and designed to transmit the collision post top reaction loads to the carbody sides.

N F

structural shelf A horizontal structural member installed at the cab end of the vehicle, located between the collision post and the corner post on each side, at a height equivalent to the bottom of the windshield.

N F

subsystem P See IEEE Dictionary. N X Xsupplier P The entity that contractually acts as the source of a N F X

35

Usage

Word Stat

us

Definition TR

BP1

614

7314

74.1

1474

.214

7514

7614

7714

78P1

482

1482

.114

8315

36P1

544

P155

8

P156

8

1570

P158

2

P162

0

RT

-1 (P

)

RT

-2 (P

)

product.NOTE-The supplier may or may not be the actual builder.

“switch” (position) P In a propulsion system, the historic name for the lowest level of positive tractive effort and power; so called because it is typically utilized for slow-speed switching movements such as yard moves, train makeup, etc.

N F

system P See IEEE Dictionary. N Fsystem safety P The application of engineering and management

principles, criteria, and techniques to optimize all aspects of safety within the constraints of operational effectiveness, time, and cost throughout all phases of the system life cycle.

N X F

system safety goals - qualitative

NA A qualitative expression of the level of fail-safety which shall be achieved by a system, expressed in terms which can be realistically compared to the results of the safety verification process.

N

system safety goals - quantitative

P A quantitative limit of the probability and/or frequency with which any vital function fails to be implemented safely.

N F

system safety program P The combined tasks and activities of system safety management and system safety engineering that enhance operational effectiveness by satisfying the system safety requirements in a timely, cost-effective manner throughout the system life cycle.

N X F

system safety program plan

P A formal document that fully describes the planned safety tasks required to meet the system requirements, including organizational responsibilities, methods of accomplishment, milestones, depth of effort, and integration with other program engineering and management functions.

N F

telegram A single network message transmitted either as a single frame or in multiple frames.

N F

time constant P See IEEE Dictionary. N Xtime critical P Applications where the communications delay is bound N F

36

Usage

Word Stat

us

Definition TR

BP1

614

7314

74.1

1474

.214

7514

7614

7714

78P1

482

1482

.114

8315

36P1

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P155

8

P156

8

1570

P158

2

P162

0

RT

-1 (P

)

RT

-2 (P

)

to a fixed upper limit, independent from the load conditions.

time, dead P See dead time. N Ftime, reaction P See reaction time. N Ftime, warm-up P See warm-up time. N Ftopology P The geometric pattern or configuration of intelligent

devices and how they are linked together for communications.

N F

track brake P A magnetic friction brake that compresses against the running rail and is activated by an electrical signal.

D F

traction system P See: propulsion system. Ftractive effort P That force generated at the wheel-rail interface as a result

of the action of the propulsion system. It may be either positive, indicating motoring/powering, or negative, indicating brake.

D F

traffic control devices P All signs, signals, markings, islands, and other devices used to regulate, warn, or guide traffic, placed on, over or adjacent to a street, highway, road, pedestrian facility, or bicycle path by authority of a public body or official having jurisdiction.

N F

traffic control signal (traffic signal)

P Any highway traffic signal by which traffic is alternately directed to stop or permitted to proceed. Also, see highway traffic signal.

N F

train P A consist of one or more basic operating units. D X X F Xtrain P One or more locomotives, with or without cars, that

operates on rails or tracks and to which all other traffic must yield the right-of-way by law at highway-rail crossings.

D F

train control system P The system for controlling train movement, enforcing train safety, and directing train operations.

N F

train level diagnostics Diagnostics that includes the output of the car level diagnostic processes from more than one vehicle.

N F

trainline(s) P Wires and/or pipes routed though and between vehicles or units by means of couplers, jumpers, or other means so that power or signals may be transmitted to all vehicles

N F

37

Usage

Word Stat

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Definition TR

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614

7314

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7514

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78P1

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1482

.114

8315

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8

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RT

-1 (P

)

RT

-2 (P

)

of the train.trainline interoperability P The ability of basic operating units that constitute a train

to communicate successfully with each other through coupler interface(s), without limitation as to the sequence or orientation of the basic operating units within the train, and without requirement for manual configuration other than optional manual confirmation of basic operating unit sequence within the train.

N F

transport time P See IEEE Dictionary. N Xtrip switch/cock P A device mounted on the truck of a vehicle, responding

to a raised arm on the wayside, used to cause an emergency brake application if a train attempts to pass a mandatory stop signal.

N F

truck P A rail vehicle component that consists of a frame, normally two axles, brakes, suspension, and other parts, which supports the vehicle body and can swivel under it on curves. If powered, it may also contain traction motors and associated drive mechanisms.

Y F

unit P See: basic operating unit. Y X X Funsafe P Having unacceptable risk of the occurrence of a hazard. N Fvehicle P A land conveyance assembly for carrying or transporting

people or objects, capable of traversing a guideway, having structural integrity and general mechanical completeness but not necessarily designed for independent operation.

Y X X F X X

vehicle loads The following are typical values and may vary as specified by the customer:AW0: empty load – The weight of the vehicle ready to run with all mounted components, including full operating reserves of lubricants, windshield fluid, etc., but without any crew or passenger load.AW1: fully seated load – AW0 plus the crew and fully seated passenger load.AW2: system load – AW1 plus 2 passengers per m2 (1.7 passenger per yd2) in standing areas.AW3: crush load – AW1 plus 4 passengers per m2 (3.3

N F

38

Usage

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Definition TR

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RT

-1 (P

)

RT

-2 (P

)

passenger per m2) in standing areas.AW4: structural load – AW1 plus 6 passengers per m2 (5 passenger per m2) in standing areas.

vehicle loads The following are typical values and may vary as specified by the customer:AW0: empty load – The weight of the vehicle ready to run with all mounted components, including full operating reserves of lubricants, windshield fluid, etc., but without any crew or passenger load.AW1: fully seated load – AW0 plus the crew and fully seated passenger load.AW2: system design load – AW1 plus 4 passengers per m2

(0.37 passenger per ft2) in standing areas.AW3: crush load – AW1 plus 6 passengers per m2 (0.56 passenger per ft2) in standing areas.AW4: structural load – AW1 plus 8 passengers per m2 (0.74 passenger per ft2) in standing areas.

N F

vital P See: safety critical N Fvital function P A function in a safety critical system that is required to be

implemented in a fail-safe manner.Note – Vital functions are a subset of safety-critical functions.

N X F X

wayside database Logged data that has been removed from the on-board database and resides at a location off the vehicle. It may or may not be available to the monitoring and diagnostic system (MDS) via data telemetry links. The MDS may transfer data from the on-board database to the wayside database via telemetry links,

F

warm-up time P See IEEE Dictionary. Nwarning system active P This is the period during which an active grade crossing

warning system is in its operational state (e.g. lights are flashing, bells are ringing). For active grade crossing warning systems equipped with gats, this time starts when the lights start to flash even though the gates have nit necessarily started any motion.

N F

weak field P In a propulsion system, a motor connection or operating N F39

Usage

Word Stat

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Definition TR

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1482

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RT

-1 (P

)

RT

-2 (P

)

mode in which the exciting field current is less than the full field value.

weight, actual P See actual weight. Xweight, crush loaded P See crushed loaded weight. Xweight, empty P See actual weight. Xwheel diameter compensation

P A function that corrects for either the wear of the wheel(s) or the difference(s) in rolling diameter between different wheels on the vehicle or both.

N F

wheel slide P During braking, the condition existing when the rotational speed of the wheel is slower than that for pure rolling contact between tread and rail/running surface.Note – For convenience and simplicity, the definition of wheel slide, wheel slip, and wheel spin ignore the presence of the microslip phenomenon generally called “creep” physically necessary to generate longitudinal force at the wheel-rail interface.

N F

wheel slip P The condition existing when the rotational speed of the wheel does not correspond with pure rolling contact between tread and rail/running surface.Note – For convenience and simplicity, the definition of wheel slide, wheel slip, and wheel spin ignore the presence of the microslip phenomenon generally called “creep” physically necessary to generate longitudinal force at the wheel-rail interface.

N F

wheel spin P During acceleration, the condition existing when the rotational speed of the wheel is faster than that for pure rolling contact between tread and rail/running surfaces.Note – For convenience and simplicity, the definition of wheel slide, wheel slip, and wheel spin ignore the presence of the microslip phenomenon generally called “creep” physically necessary to generate longitudinal force at the wheel-rail interface.

N F

window P In a graphical user interface, a defined portion of the display screen that is separated by a from the rest of the screen and which may be opened, closed, resized and moved by the user.

N F

40

41

REFERENCE STANDARDS

The information contained in this listing is based upon the standard drafts as listed below:

WG No. Draft Date. DescriptionASMERT-1 D6 05/04 Structural Requirements for Light Rail Transit VehiclesRT-2 D7 06/23-04 Structural Requirements for Heavy Rail Transit Vehicles

IEEE1 1473 1999 Communication Protocol on Trains2 1474.1 1999 Communications-Based Train Control (CBTC) Performance and

Functional Requirements2A 1474.2 2003 User Interface Requirements in Communications Based Train Control

(CBTC) Systems2B P1582 D1.0 02/02 CBTC Wayside Environmental Requirements3 P1482 D4 10/22/02 Rail Vehicle Monitoring and Diagnostic Systems

3A 1482.1 1999 Rail Transit Vehicle Event Recorders4 1483 2000 Verification of Vital Functions in Processor-Based Systems Used in Rail

Transit Control5 1475 1999 Functioning of and Interfaces among Propulsion, Friction Brake and

Train-borne Master Control on Rail Transit Vehicle6 1476 2000 Passenger Train Vehicle Auxiliary Power Systems Interfaces7 1477 1998 Passenger Information System for Rail Transit Vehicles8 1478 2001 Environmental Conditions for Rail Transit Car Electronic Equipment9 P1544 D4 NA Transit Communications Interface Profiles for Rail Transit Systems10 1536 2002 Rail Transit Vehicle Battery Physical Interface11 P16 D4.9b 01/03 Electrical and Electronic Control Apparatus on Rail Vehicles12 P1558 D5.2 03/04/04 Software Documentation13 P1568 D4.2 04/03 Electrical Sizing of NiCad Batteries14 1570 2002 The Interface Between the Rail Subsystem and the Highway Subsystem

at a Highway Rail Interface15 P1620 Wireless Transport of Non-Train Control data between Rail Transit

Vehicle and Wayside Systems

Note: P indicates proposed standard. Standards that are issued do not contain the P prior to the number.

Revisions

Version 1: May 8, 1998

42

Version 2: May 28, 1998Added version numbers to this document.The following definitions were modified: adhesion, basic operating unit, braking effort, consist, control voltage, derail detector, electric coupler, emergency brake, fade, load weighing, master control, no motion, parking brake, safety critical, train, trainlines(s), wheel slide, track brake, unit, wheel slip, and wheel spin.These changes are based upon P1475 D 4.1.

Version 3 June 8, 1998Added health for P1482.1

Version 4 June 17, 1998Includes abbreviations and added other document usage to the definition table.Added definitions for manufacturer.Modified the FRA Event Recorder to FRA Compliant Event Recorder.

Version 5 September 11, 1998Abbreviations were added for AWG, ML, MTBE, MTBF, PD, PV and TCRP.Definitions were added for doors closed, doors locked, headway, manufacturer, movement authority and topology.Definitions were revised for apparatus interoperability, basic operating unit, brake – emergency, brake – track, consist, control voltage, coupler interface, doors open, load weighing, parallel, safety critical, series, topology, and weight – actual.

Version 6 September 17, 1998Abbreviations were added for EMC, HEP, LVPS, and NEMA.Abbreviation usage added for ANSI in 1476.Definitions were added for aging factor, constant power load, HVAC compressor pull down, rebuilt, remanufactured, resistive load, sampling rate, state of charge, and storage rate.Definition usage deleted for failure in 1482.1.Definition usage added for authority having jurisdiction and vehicle in 1476

Version 7 October 3, 1998Definition for automatic train supervision was revised to include a note.

Version 8 November 3, 1998Corrected abbreviations for FRA and FTA.Definition for block was changed to use the IEEE Dictionary.The definition of safety critical was changed based on the recirculation ballot.

Version 9 December 1, 1998Added definitions the mean time between hazardous events and self-revealing component failures.Revised definitions for hardware failure, mishap, safe, safety critical, software error and unsafe.These changes were based upon P1483 version D0.14.

43

Version 10 January 22, 1999Corrected abbreviation for IEC and location of NFPA abbreviation.Added definitions for aging factor (previous IEEE Dictionary), constant current loads and interface (previously IEEE Dictionary).Revised definitions for constant power loads, HVAC compressor pull down, lay-up condition and resistive loads.

Version 11 June 8, 1999Added abbreviations for AAR, ASCE, CENELEC, EMI, FMEA, ITE, MTTR, MTTRS, NOAA, RF, SAE, SSHIA, SSn-FTA, SVP and UL.Added status column to definition section.Added definitions for buff load, carbody, closing speed, crashworthiness, crush load, designer, energy absorption load, operator, primary injury, safe braking model, seated load, secondary injury, system design load, vital and vehicle mass.Updated definitions for auxiliary wayside system, communication-based train control, concept level, coupler interface, fail-safe, fault tree analysis, functional fault tree, functional level, heavy rail transit, implementation level, mean time between hazardous events, movement authority, safe braking model, safety critical, time critical and trainline interoperability.Added additional usage to ATO and time critical.Added a table to define the classes associated with 1478 environmental Standards for Rail Transit Equipment.Added ASME RT1 standard to table to indicate the agreed upon joint usage of definitions between the two organizations.Added working groups 9 through 12 to Reference Standards Table.

Version 12 July 2, 1999Corrected abbreviation for IEC.Added abbreviation for IVPS.Added definitions for galvanic isolation, intermediate voltage power supply (IVPS), load shedding and low voltage power supply (LVPS).Corrected definitions for aging factor, constant current loads, constant power loads, and heating ventilation and air conditioning (HVAC) compressor pull down.Updated revision level for standard P1476.

Version 13 July 15, 1999Corrected definition for functional fault tree.Updated revision level for standard P1483.

Version 14 October 14, 1999Modified definitions for carbody, crashworthiness, end sill compression (buff load) and system design load.Buff load was changed to end sill compression (buff load).Deleted designer and operator.

Version 15 January 7, 2000Added abbreviation for BC.Corrected abbreviation for TRCP.Corrected definitions for aging factor, constant power load, galvanic isolation, intermediate voltage power supply and resistive loads.Updated revision levels for various reference standards.

Version 16 November 27, 2000Added abbreviations for AASHTO, ACSES, APTA, AREMA, GPS, GUI, ITS, MDS and NTCIP.

44

The definition status was revised to include published indicated by the letter “P”. Published means accepted by the standard’s editors.Definitions were revised to agree with the final wording and format used by the standard’s editors.Definitions were revised to agree with the latest drafts of the standards as listed in the reference standards table.Added definitions for ambient temperature, bonding, corona effect, creepage, designer, display, ergonomics, function key, gap, grounding, passenger mass, screen, user interface and window.Deleted definitions for FRA compliant event recorder, primary injury, rebuilt and secondary injury.Deleted the 1478 class definition table, as the classifications were not used in the final standard.

Version 17 December 6, 2000Corrected abbreviation for APTA.

Version 18 February 13, 2001Added abbreviations for ampere hours.Added definitions for high discharge rate, low discharge rate, medium discharge rate, and multi-cell unit.Added usage of 1536 to abbreviations and definitions.Added 1536 revision level to reference standards table.

Version 19 April 12, 2002Added definitions for communication based train control user, control action, display screen, function key, penalty overspeed condition, short-time operating voltage and communication-based train control user profile.Modified definitions for display, user interface and windows.Added ASME RT-2 standard to reference standard table.Corrected Software Documentation working group number form P1588 to P1558.

Version 20 October 19, 2004The status column was updated to include the approval of standards P16 and P1558, and issuance of 1536 and 1570. The abbreviation and definition tables status column was revised so that a column exists for each standard. The first usage of the definitions is indicated by a bold letter “F” with other usage as a letter “X”.AbbreviationsAdded ATCS, BTE, DARPA, DBDD, DBMS, EN, ESD, FHWA, HRI, ICD, ICEA, IPC, ISO-OSI, LSB, MIL, MU, MUTCD, Ni-Cad, NRTL, PTU, RFC, SCI(s), SCM, SCMP, SDD, SPMP, SQA, SQAP, SRS, SRTM, STP, STPr, STR, SUM, SVD, SVVP, SVVR, TCP, TIA, V&V, UDP, UNS and UTC.Modified ATC - 2 lines and ATS – 3 lines. DefinitionsAdded active diagnostics, active grade crossing warning system, advanced preemption and advanced preemption time, advanced transportation controller, anticlimber (RT-1 & RT-2), anti-telescoping plate (RT-2), articulation (RT-1), application variable, battery duty cycle, bench test equipment, binary string, closing speed (RT-1 & RT-2), communication-based train control user interface, communications based train control user profile, component, consist (RT-2), controller assembly, corner posts (RT-1 & RT-2), crash energy management (CEM) (RT-1 & RT-2), crossing, customer (RT-1 & RT-2), data element, diagnostic test equipment, E-telegram, end frame (RT-1), end compression load (buff load) (RT-1), entrance gate, event, exit gate, fully charged capacity, function level diagnostics, gate down, gate up, global level diagnostics, heavy rail transit vehicle (RT-2), hexadecimal string, highway-rail grade crossing, highway rail interface, highway rail intersection, highway road or street, input, highway traffic signal, highway traffic signal controller, interconnect, interconnection circuit, island, island occupancy, light emitting diode, light rail vehicle (RT-1) liquid crystal display, log, logged data, manufacturer(RT-1 & RT-2), minimum yield strength (RT-1 & RT-2), minimum warning time, monitored interconnected operation, on-board database, output, parameter, passenger weight (RT-1 & RT-2), passive diagnostics, period, permanent deformation (RT-1 & RT-2), physical type, portable test equipment, preemption, preemption design time, preemption warning active, primitive type, process data marshalling, process variable, processed data

45

record, R-telegram, rated capacity, roadway-rail intersection, sample, sample data record, sampling rate, sheathing (RT-1 & RT-2), simultaneous preemption, software integrity level, structural shelf (RT-1 & RT-2), telegram, traffic control devices, traffic control signal, train, train level diagnostics, warning system active and wayside database.Changed bonding, corona effect, creepage, gap, grounding and screen as these are defined in the IEEE Standard 100 (Dictionary).Deleted crush load vehicle load, fully seated vehicle load, ready to run load vehicle load, structural load vehicle load (AW4) and system load vehicle load (AW2).Updated actual weight, aging factor, alertness function, authority having jurisdiction, automatic train operation, automatic train protection, automatic train supervision, carbody (RT-1 & RT-2) , collision posts (RT-1 & RT-2), crashworthiness (RT-1 & RT-2), diagnostic, door locked, failure, fault, full field, high discharge rate (H), intermediate voltage power supply, low discharge rate (L), master controller, medium discharge rate (M), monitoring, passenger weight (previously passenger mass) (RT-1 & RT-2), purchaser, reverse, safety assurance, safety assurance concept, safety validation, safety verification, short-time operating voltage, state-of-charge factor, status, structural energy absorption zone (RT-1 & RT-2), supplier, user interface, user profiles, vehicle loads (previously vehicle mass) (RT-1 & RT-2), vital function and wheel diameter compensation.

definitions.doc

46