SODA

Hump Yard Track Allocation with Temporary Car Storage

Bohlin, Markus and Flier, Holger and Maue, Jens and Mihalák, Matúš (2011) Hump Yard Track Allocation with Temporary Car Storage. In: 4th International Seminar on Railway Operations Modelling and Analysis, 16-18 Feb 2011, Sapienza - University of Rome, Italy.

[img]
Preview
PDF - Accepted Version
537Kb

Abstract

In rail freight operation, freight cars need to be separated and reformed into new trains at hump yards. The classification procedure is complex and hump yards constitute bottlenecks in the rail freight network, often causing outbound trains to be delayed. One of the problems is that planning for the allocation of tracks at hump yards is difficult, given that the planner has limited resources (tracks, shunting engines, etc.) and needs to foresee the future capacity requirements when planning for the current inbound trains. In this paper, we consider the problem of allocating classification tracks in a rail freight hump yard for arriving and departing trains with predetermined arrival and departure times. The core problem can be formulated as a special list coloring problem. We focus on an extension where individual cars can temporarily be stored on a special subset of the tracks. An extension where individual cars can temporarily be stored on a special subset of the tracks is also considered. We model the problem using mixed integer programming, and also propose several heuristics that can quickly give feasible track allocations. As a case study, we consider a real-world problem instance from the Hallsberg Rangerbangård hump yard in Sweden. Planning over horizons over two to four days, we obtain feasible solutions from both the exact and heuristic approaches that allow all outgoing trains to leave on time.

Item Type:Conference or Workshop Item (Paper)
ID Code:5089
Deposited By:Markus Bohlin
Deposited On:21 Dec 2011 16:14
Last Modified:21 Dec 2011 16:14

Repository Staff Only: item control page