Solving large scale crew scheduling problems in practice
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This paper deals with large-scale crew scheduling problems arising at the main Dutch railway operator, Netherlands Railways (NS). NS operates about 30000 trains a week. All these trains need a driver and a certain number of guards. Some labor rules restrict the duties of a certain crew base over the complete week. Therefore, splitting the problem in several subproblems per day leads to suboptimal solutions.
In this paper, we present an algorithm, called LUCIA, which can solve such huge instances without splitting. This algorithm combines Lagrangian heuristics, column generation and fixing techniques. We compare the results with existing practice. The results show that the new method significantly improves the solution.
KeywordsCrew scheduling Large-scale optimization Column generation
We want to thank Tiago Dias and Rudi Araújo for their important contribution on the implementation of the software code related with preparation of data, in particular the generation of connections.
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