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Railway Operations: Issues and Railway Operations: Issues and ObjectivesObjectives
Capacity managementCapacity management
Infrastructure planningInfrastructure planning
Timetable preparation Timetable preparation
Management of day-to-day movement Management of day-to-day movement of trains. of trains.
Objectives of the SimulatorObjectives of the Simulator Observing effects of making changes to the Observing effects of making changes to the
existing timetableexisting timetable
Estimating section capacityEstimating section capacity
Analyzing the effect of introducing extra Analyzing the effect of introducing extra scheduled trains in the sectionscheduled trains in the section
Objectives of the SimulatorObjectives of the Simulator
Visualizing the consequences of signal failure Visualizing the consequences of signal failure and delays of trains.and delays of trains.
To model and represent different arrival To model and represent different arrival patterns and compositions of traffic on section.patterns and compositions of traffic on section.
Evaluating investment proposals at local levelEvaluating investment proposals at local level
Objectives of the SimulatorObjectives of the SimulatorTo present the impact of changed operational To present the impact of changed operational
parameters such asparameters such asSpeed of trains Speed of trains Acceleration/DecelerationAcceleration/DecelerationLoop entry/exit velocitiesLoop entry/exit velocities
To experiment with different scheduling possibilities To experiment with different scheduling possibilities based on -based on -
ThroughputThroughputDelaysDelaysPrioritiesPrioritiesDue dates latenessDue dates latenessSlack in timetables.Slack in timetables.
Capacity PlanningCapacity Planning
Line /Section CapacityLine /Section Capacity::Number of (standardised) trains that can be run on Number of (standardised) trains that can be run on
a given sectiona given section
Estimated byEstimated by Scott’s FormulaScott’s Formula Master chart preparationMaster chart preparation
This can be done only for a static, known traffic This can be done only for a static, known traffic scenarioscenario
Current notion of capacityCurrent notion of capacity
The number of trains that can be handled with “reasonable” transit time (say, twice the bareminimum transit time).
This accounts for the prevailing traffic mixand congestion effects.
SoftwareSoftware Uses Uses Java 2Java 2 as development platform. as development platform. User specified data files are read and User specified data files are read and
station and blocks are modeled station and blocks are modeled accordinglyaccordingly
Trains are sorted in the order of their Trains are sorted in the order of their prioritiespriorities
Runs in ‘Runs in ‘one train at a time’one train at a time’ oror‘‘complete simulation’complete simulation’ modes modes
InputsInputs
Station detailsStation details Loop detailsLoop details Block detailsBlock details Scheduled trains data Scheduled trains data Freight train dataFreight train data Simulation parameter Simulation parameter
datadata
Gradient Gradient specification dataspecification data
Gradient’s effect Gradient’s effect detailsdetails
Signal failure detailsSignal failure details Delay specification Delay specification
datadata
In MS Excel or ASCII Text format
OutputOutputLoop /platform occupanciesLoop /platform occupanciesBlock occupanciesBlock occupanciesTraversal time of trains (timetabled Traversal time of trains (timetabled passenger as well as non-timetabled passenger as well as non-timetabled freight trains); Averages of such timesfreight trains); Averages of such timesPlot of distance vs. time in the master Plot of distance vs. time in the master chart formatchart formatVelocity profile and signal aspect displaysVelocity profile and signal aspect displaysSignal headway Signal headway
Start
Read The Data
Initialize all signals green, all sections Free
Sort Trains by Priority
Set signal failure
Get Train from sorted list
Schedule a train
Sort signals, prohibited intervals, set signal failure
Is any train left
Stop
Yes No
Algorithm
Departure Time Based Priority Departure Time Based Priority Scheduling of Passenger TrainsScheduling of Passenger TrainsThe train with The train with higher priorityhigher priority is scheduled first is scheduled first
If two trains have the same priorityIf two trains have the same priorityComparedCompared f for their or their departure times, departure times, for scheduled for scheduled passenger trains passenger trains
Compared for their Compared for their arrival times,arrival times, for freight trains for freight trains
Passenger train with earliest departure or freight Passenger train with earliest departure or freight train with earliest arrival time is scheduled firsttrain with earliest arrival time is scheduled first
Preference Based Resource Preference Based Resource Allocation for Passenger TrainsAllocation for Passenger Trains
Exploring other Exploring other possible alternate pathspossible alternate paths through the station if the preferred loop is through the station if the preferred loop is not available by passenger trainnot available by passenger train
Ensures a much efficient use of available Ensures a much efficient use of available resourcesresources to facilitate a smooth passage to facilitate a smooth passage past the section.past the section.
Simulation Output without Simulation Output without searching alternate pathssearching alternate paths
Simulation Output with searching Simulation Output with searching alternate pathsalternate paths
Signal Spacing and Headway Signal Spacing and Headway Analysis on Suburban sectionsAnalysis on Suburban sections
Supports automatic signaling on mainline Supports automatic signaling on mainline sections and relevant track and train detail sections and relevant track and train detail in operation.in operation.
Study for Central Railway on signal spacinStudy for Central Railway on signal spacing and headway analysis.g and headway analysis.