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 Observing effects of making changes to the existing timetable Estimating section capacity Estimating section capacity Analyzing the effect of introducing extra scheduled trains in the section Analyzing the effect of introducing extra scheduled trains in the section

Objectives of the Simulator Visualizing the consequences of signal failure and delays of trains. Visualizing the consequences of signal failure and delays of trains. To model and represent different arrival patterns and compositions of traffic on section. To model and represent different arrival patterns and compositions of traffic on section. Evaluating investment proposals at local level Evaluating investment proposals at local level

Objectives of the Simulator To present the impact of changed operational parameters such as 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 - To experiment with different scheduling possibilities based on -ThroughputDelaysPriorities Due dates lateness Slack in timetables.

Capacity Planning Line /Section Capacity: Number of (standardised) trains that can be run on a given section Estimated by Scott’s Formula Scott’s Formula Master chart preparation Master chart preparation This can be done only for a static, known traffic scenario

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  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 Station details Loop details Loop details Block details Block details Scheduled trains data Scheduled trains data Freight train data Freight train data Simulation parameter data Simulation parameter data Gradient specification data Gradient’s effect details Signal failure details Delay specification data In MS Excel or ASCII Text format

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

Algorithm

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 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 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 resources to facilitate a smooth passage past the section.

Simulation Output without searching alternate paths

Simulation Output with searching alternate paths

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. Study for Central Railway on signal spacing and headway analysis.