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Line Capacity Simulator Railway Operations: Issues and Objectives Capacity management Infrastructure planning Timetable preparation Management of day-to-day movement of trains. Objectives of the Simulator Observing effects of making changes to the existing timetable

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Presentation Transcript
railway operations issues and objectives
Railway Operations: Issues and Objectives
  • Capacity management
  • Infrastructure planning
  • Timetable preparation
  • Management of day-to-day movement of trains.
objectives of the simulator
Objectives of the Simulator
  • Observing effects of making changes to the existing timetable
  • Estimating section capacity
  • Analyzing the effect of introducing extra scheduled trains in the section
objectives of the simulator4
Objectives of the Simulator
  • Visualizing the consequences of signal failure and delays of trains.
  • To model and represent different arrival patterns and compositions of traffic on section.
  • Evaluating investment proposals at local level
objectives of the simulator5
Objectives of the Simulator
  • To present the impact of changed operational parameters such as
      • Speed of trains
      • Acceleration/Deceleration
      • Loop entry/exit velocities
  • To experiment with different scheduling possibilities based on -
      • Throughput
      • Delays
      • Priorities
      • Due dates lateness
      • Slack in timetables.
capacity planning
Capacity Planning

Line /Section Capacity:

Number of (standardised) trains that can be run on a given section

Estimated by

  • Scott’s Formula
  • Master chart preparation

This can be done only for a static, known traffic scenario

current notion of capacity
Current notion of capacity

The number of trains that can be handled with

“reasonable” transit time (say, twice the bare

minimum transit time).

This accounts for the prevailing traffic mix

and congestion effects.

software
Software
  • Uses Java 2 as development platform.
  • User specified data files are read and station and blocks are modeled accordingly
  • Trains are sorted in the order of their priorities
  • Runs in ‘one train at a time’ or‘complete simulation’ modes
inputs
Station details

Loop details

Block details

Scheduled trains data

Freight train data

Simulation parameter data

Gradient specification data

Gradient’s effect details

Signal failure details

Delay specification data

Inputs

In MS Excel or ASCII Text format

output
Output
  • Loop /platform occupancies
  • Block occupancies
  • Traversal time of trains (timetabled passenger as well as non-timetabled freight trains); Averages of such times
  • Plot of distance vs. time in the master chart format
  • Velocity profile and signal aspect displays
  • Signal headway
departure time based priority scheduling of passenger trains
Departure Time Based Priority Scheduling of Passenger Trains
  • The train with higher priority is scheduled first
  • If two trains have the same priority
      • Compared for their departure times, for scheduled passenger trains 
      • Compared  for their arrival times, for freight trains
  • Passenger train with earliest departure or freight train with earliest arrival time is scheduled first
preference based resource allocation for passenger trains
Preference Based Resource Allocation for Passenger Trains
  • Exploring other possible alternate paths through the station if the preferred loop is not available by passenger train
  • Ensures a much efficient use of available resourcesto facilitate a smooth passage past the section.
signal spacing and headway analysis on suburban sections
Signal Spacing and Headway Analysis on Suburban sections
  • Supports automatic signaling on mainline sections and relevant track and train detail in operation.
  • Study for Central Railway on signal spacing and headway analysis.
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