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A Note on “Multistage Methods for Freight Train Classification”

Dirk Briskorn (dirk.briskorn***at***uni-siegen.de)
Florian Jaehn (florian.jaehn***at***wiwi.uni-augsburg.de)

Abstract: The paper “Multistage Methods for Freight Train Classification” by Jacob et al. ([2]) provides a great insight to the theory and practice of sorting procedures at shunting yards. In [2] many relevant shunting situations (e.g. single or multiple inbound trains, single or multiple outbound trains, (un)restricted number of tracks, (un)restricted track capacity) are formally specified as optimization problems. Then, for almost all of them either an exact polynomial time algorithm or an NP-hardness proof is provided. However, the case of multiple inbound trains, which is of high practical relevance, is left open. We close this gap by providing a proof of NP-hardness.

Keywords: Shunting Yard; Multistage Sorting; Complexity

Category 1: Applications -- OR and Management Sciences

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Entry Submitted: 11/21/2012
Entry Accepted: 11/21/2012
Entry Last Modified: 12/23/2012

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