Structure and Simulation Evaluation of an Integrated Real-Time Rescheduling System for Railway Networks |
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Authors: | Marco Luethi Giorgio Medeossi Andrew Nash |
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Affiliation: | (1) Institute for Transport Planning and Systems, Swiss Federal Institute of Technology, Zurich, Switzerland;(2) Department of Civil Engineering, University of Trieste, Trieste, Italy;(3) Vienna Transport Strategies, Vienna, Austria |
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Abstract: | A critical problem faced by railways is how to increase capacity without investing heavily in infrastructure and impacting
on schedule reliability. One way of increasing capacity is to reduce the buffer time added to timetables. Buffer time is used
to reduce the impact of train delays on overall network reliability. While reducing buffer times can increase capacity, it
also means that small delays to a single train can propagate quickly through the system causing knock-on delays to trains
impacted by the delayed train. The Swiss Federal Railways (SBB) and Swiss Federal Institute of Technology (ETH) are researching
a new approach for real-time train rescheduling that could enable buffer times to be reduced without impacting schedule reliability.
This approach is based on the idea that if trains can be efficiently rescheduled to address delays, then less buffer time
is needed to maintain the same level of system schedule reliability. The proposed approach combines a rescheduling algorithm
with very accurate train operations (using a driver-machine interface). This paper describes the proposed approach, some system
characteristics that improve its efficiency, and results of a microscopic simulation completed to help show the effectiveness
of this new approach. The results demonstrate that the proposed integrated real-time rescheduling system enables capacity
to be increased and may reduce knock-on delays. The results also clearly showed the importance of accurate train operations
on the rescheduling system’s effectiveness. |
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Keywords: | Real-time rescheduling Microscopic railway simulation Rail traffic operation |
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