Simulation Of Planning Strategies For Track
Allocation At Marshalling Yards
Author(s)
M. Bohlin, S. Gestrelius & F. Khoshniyat
Abstract
Planning the operational procedures in a railway marshalling yard is a complex
problem. When a train arrives at a marshalling yard, it is uncoupled at an arrival
yard and then its cars are rolled to a classification yard. All cars should
eventually be rolled to the classification track that has been assigned to the train
they’re supposed to depart with. However, there is normally not enough capacity
to compound all trains at once. In Sweden, cars arriving before a track has been
assigned to their train can be stored on separate tracks called mixing tracks. All
cars on mixing tracks will be pulled back to the arrival yard, and then rolled to
the classification yard again to allow for reclassification. Today all procedures
are planned by experienced dispatchers, but there are no documented strategies
or guidelines for efficient manual planning. The aim of this paper is to examine
operational planning strategies that could help dispatchers find a feasible
marshalling schedule that minimizes unnecessary mixing. In order to achieve this
goal, two different online planning strategies have been tested using
deterministic and stochastic simulation. The Hallsberg marshalling yard was
used as a case study, and was simulated for the time period between December
2010 and May 2011. The first tested strategy simply assigns tracks to trains on a
first come-first served basis, while the second strategy uses time limits to
determine when tracks should be assigned to departing trains. The online
planning algorithms have been compared with an offline optimized track
allocation. The results from both the deterministic and the stochastic simulation
show that the optimized allocation is better than all online strategies and that the
second strategy with a time limit of 32 hours is the best online method.
Keywords: railways, marshalling, marshalling yards, simulation.
Keywords
Keywords: railways, marshalling, marshalling yards, simulation.
Related Book
Other papers in this volume
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