STANDARD MOVING & FIXED DIMENSIONS FOR DEDICATED FREIGHT CORRIDOR

STANDARD MOVING &

FIXED DIMENSIONS FOR

DEDICATED FREIGHT CORRIDOR

MMD for DFC

• Dedicated Freight Corridor (DFC) has been announced to be constructed in Howrah-Delhi and Mumbai-Delhi sectors.

• The axle load projected to run on this DFC is 30 tons.

• With most of the traffic expected to be carried on this DFC consisting of low density commodities like Food Grain and Coal, there is a need to enlarge the Maximum Moving Dimension (MMD) so as to accommodate sufficient quantities to generate required axle load.

Inter-operability Requirements

• Looking at the DFC in isolation, there shall not be any problem in increasing the MMD to whatever extent.

• But the wagons designed to run on the new corridor will have to run on existing system either when they are running empty or in the originating and destination spokes.

• This necessitates a study of our existing SOD and to identify the means to progressively adopt larger, wider and higher, wagons so as to fulfill the objective of carrying higher axle loads.

DIMENSION 2004MAXIMUM MOVING

Existing MMD

Top Of Rail

Proposed Fixed Structure Gauge for Dedicated Freight Corridor

8870

mm

Only installations necessary for trainoperation allowed in this area.

6810

7300

mm

for

non-

elec

trifi

ed s

ectio

n

LEGEND - FIXED STRUCTURE

- MMD FOR FREIGHT CORRIDOR- FIXED STRUCTURE FOR ELECTRIFICATION

MMD for DFC in Isolation

DENSITIES OF VARIOUS COMMODITIES

Commodities of open wagon Commodities of covered wagon

Commodity Density (t/m3)

Commodity Density (t/m3)

Iron ore 2.10 to 2.6 Cement 1.440

Copper & zinc ore

2.5 to 2.9 Food grains (wheat) 0.801

Lead ore 5.1 Fertilizer (urea) 0.728

Lime stone broken

1.4 Sugar 0.688

Bauxite 1.4 Salt granulated 0.897

Manganese ore 1.8

Coal 0.87 to 1.06

LOADING REQUIREMENT (NOS. OF BAG)

S. No.

Commodity Existing wagon with 20.32 ton axle

25 ton axle with Pay to Tare ratio of 1:4

30 ton axle with Pay to Tare ratio of 1:4

1 Cement

(50 kg Bag)

1134 1600 1920

2 Food grain (wheat)

60kg. Bag

50kg. Bag945

1134

1333

1600

1600

1920

3 Fertilizer (urea) (50 kg Bag)

1134 1600 1920

PATTERN OF RICE LOADING IN BCNA WAGON AT FCI/BARABANKI

PATTERN OF FERTILIZER LOADING IN BCNA WAGON AT INDOGULF/JAGDISHPUR

FIELD TRIAL ON BCNA WAGON

The loadability found in field trials-

Sl.No.

Commodity Size of bags

Nos. of bags loaded in BCNA

Tonnes

1 Food grain (Rice/Wheat)

50 kg 1256 62.8t

(CC+4+2t)

2 Fertilizer

(Urea)

50 kg 1256 62.8t

(CC+4+2t)

Above figures are based on pattern of loading being followed at present.

Clearance between Moving Dimension and Fixed Structure

• Even on a straight track, a rolling stock keeps moving on either side of its central position due to factors like:– tolerances and defects in rolling stock, – tolerances and defects in track, – wind effect, – uneven loading etc,.


• The clearance between Moving Dimensions and Standard Dimensions (Fixed structure) depends primarily on the lateral and vertical movement of the vehicle.

• Profile of a rolling stock drawn after taking into account the lean, swing and sway etc. is known as Kinematic Profile.


• IR does not have kinematic profiles for rolling stock.

• Efforts have been made in recent times to calculate the expected lateral movement of a wagon to have an idea about the kinematic movement.

• It has now been accepted that the kinematic movement of a wagon is as much as 300mm, either way.

• Availability of accurate kinematic profiles of rolling stock may help in precise working out of clearances.


• The clearance between Static and kinematic profile is required to be enhanced further to take care of:– a passenger or his luggage projecting out of a

moving train, – freight stock running with bulging/ open doors, – track being out of alignment and – lean of the line side structures etc.

Track Alignment Tolerance -A-

Laying and maintenance tolerance for track.

Rolling Stock Construction Tolerance -B-

Manufacturers tolerance for Rolling Stock Construction.

Rolling Stock Kinematic Gauge -C-

For lean and sway of Rolling Stock.

Line Side Structure Limit Gauge -D-

For bulging doors or For bulging doors or leaning passengers.leaning passengers.

Line Side Structure Tolerance -E-

For lean in structures.

Breakup of Clearance between Moving Dimension and Fixed Structure

PLATFORM WALL/COPING

MINIMUM HEIGHT WHERE ELECTRIC TRACTION IS IN USE OR LIKELY TO BEINTRODUCED [ITEM 10 (II)]

PROFILE OF MMD AND STRUCTURE GAUGE FOR SCHEDULE I AND II



SCHEDULE - II PROFILE

SCHEDULE I,EXISTING WORK PROFILE

SCHEDULE I NEW WORKS PROFILE

-SPRING DEFLECTION DIFFERENCE 50mm-CROSS LEVEL OUT 50mm-INSTANTANEOUS AXLE DIA DIFFERENCE 5mm DUE TO CONICITY

55 X 3735 + 50 X 3735----- ------- 1676 2260

122.5 + 82.63 = 205

Estimation of Kinematic Movement

LATERAL SHIFT-BOLSTER SWING : 25mm-AXLE BOX CLEARANCE : 16mm

-GAUGE PLAY FOR SINOSIDEL MOVEMENT

1676 - 1600 - 16 = 22 2TOTAL 25+16+22 = 63

IF SIDE HEIGHT IS 4000mmTOTAL SIDE WAY MOVEMENT 205+90 = 295mm FOR 3735 219.5+90 = 309.5mm SAY 310mm FOR 4000

Estimation of Kinematic Movement

Comparative MMDs and Fixed Structure Gauges- AAR V/s IR

Comprasion of MMD of I.R. with MMD on UIC ,BRITISH Railways

4265

4021

3735

I R Coupler Height

1567,5

1650

102

1676 1170

RAIL LEVEL11

0530

5

76032

5037

0040

1043

10

1520

1620

1250

13040

0

1170

1425

1645

1120

100

135

3750

3965

3080

3300

3440

280

1000

MMD UIC MMD,BRITISH

MMD, IR

Possibility of Increasing the Height

• Height of a wagon is restricted by cover over platform at its edges and OHE at the center.

• Considering this aspect, maximum height of the wagon at sides can not be raised beyond 3735 mm, existing in the present MMD.

• Similarly, at center, this may be raised to a maximum of 4265 mm, as existing.

NOTE:- ALL DIMENSIONS ARE IN MILLIMETRES EXCEPT WHERE OTHERWISE SHOWN.

NOTE:-THE DISTANCES SPECIFIED, APPLY ONLY IN CASE OF STRAIGHT TRACK. ONCURVES, THE HORIZONTAL DISTANCE SHOULD BE INCREASED BY AN AMOUNT'D' TO ALLOW FOR THE LEAN DUE TO SUPER-ELEVATION CALCULATED BYTHE FOLLOWING FORMULA, WHERE 'H' IS THE HEIGHT OF THE CONTACT WIRE, 'S' THE SUPER-ELEVATION AND 'G' THE GAUGE OF THE TRACK,ALL DIMENSIONS BEING IN METRES; D=HxS/G

STANDARD DIMENSIONS IN STATIONSTO SUIT 25 kV.A.C. TRACTION SCHEDULE I-CHAPTER II

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T P

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MAX & MIN HEIGHT FOR A HIGH PASSENGER PLATFORM

MAX HEIGHT FOR A LOW PASSENGER PLATFORM

MAX HEIGHT FOR GOODS PLATFORM

NOTE:-MIN. HEIGHT WHERE D.C. TRACTION IS IN USEOR LIKELY TO BE USED ( ITEM 10, NOTE a).

MINIMUM HEIGHT FOR CONTINUOUS COVERING IN PASSENGER STATIONS.

PIL

LA

RS

, LA

MP

S &

CO

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PA

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PL

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RAIL LEVEL

STRUCTURE


Minimum height of OHE =4580mmPlatform coping


• In case of sections having structures as per Schedule II of SOD, running of larger wagons is not possible.

• In case of sections conforming to Schedule I (New works), MMD can be increased in width.

• These sections will still have certain structures built at 2135 mm from center of track like signal post between tracks, the maximum width can be 3560 mm with severe speed restrictions at such locations.

• The increase in width can be effected only above 1065mm from rail level, due to Platforms.

• Such wider stock will be section specific.

Feasibility of running larger wagons on existing system


• It is feasible to reduce the clearance of 510 mm available in Sch-I by 75mm. This is possible by cutting into allowance available for any thing hanging out of a wagon including bulging doors.

• This gives an additional width of 150 mm, taking the same to 3400 mm against 3250mm existing.

• Indian Railway’s have experience of running BOBR wagons, with a width of 3500 mm.

• This shall be utilized to decide the width of new wagons to be manufactured for DFC with inter-operability in mind.

PROFILE OF BOBR WAGON

PROPOSED MMD FOR WIDER FREIGHT STOCK


• BOBR wagons have been permitted to run on certain identified sections. Following special precautions have been specified for movement of these wagons:– The wagon will run at restricted speed at locations where track

centers are less than 4570mm and structure distance is less than 2135mm.

– Suitable precautions for safety of passengers standing on the platform.

– Before introduction of the wagon on any route a campaign of education of the line staff will be carried out to warn them of additional width of these wagons.

– The wagons have been painted with distinctive colour code to make them stand out amongst other wagons i.e. red zebra strips on white background at all the four corners.


• Following inference can be drawn:– A wagon can be constructed, beyond the

MMD width, say 3500 mm, with suitable precautions.

– These wagons shall run on identified routes, so as to provide vital links to DFC.

– These wagons shall be door less or have only sliding doors.

– Height at center of these wagons shall be restricted to 4265 mm and at side to 3735mm.

Conclusions: DFC

• Proposed MMD and schedule of fixed structures to be adopted on Dedicated Freight Corridor shall be as follows:

– Width: 3660mm.– Height: 6810mm.– This MMD shall be the future MMD for DFC or can

be adopted for such services as are confined only to the DFC.

• Schedule of fixed structure shall be decided based on the kinematic profile of wagons built to this MMD.

Conclusions: Inter-operability

– Running of larger wagons on existing network is possible only on specific sections, built as per Schedule–I after removing all existing infringements permitted under schedule-II and imposition of suitable speed restrictions wherever actual lateral clearance becomes less than 355 mm.

Conclusions: Inter-operability• To implement this, following action is called for:

– A multi disciplinary committee, at Railway Boards level, shall identify the sections on which the proposed larger stock is to be run.

– Once the routes are identified, each zonal railway on the identified routes shall identify the infringements which must be removed before introduction of such wider stock.

– Zonal railways shall also identify the locations where speed restrictions are to be imposed due to inadequate clearance.

– These wagons shall run only on identified routes, so as to provide vital links to DFC, and shall be door less or have only sliding doors.

Documents

STANDARD MOVING & FIXED DIMENSIONS FOR DEDICATED FREIGHT CORRIDOR