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Published in:
2012 | OriginalPaper | Chapter
Column Generation for Multi-Matrix Blocking Problems
Authors : Robert Voll, Uwe Clausen
Published in: Operations Research Proceedings 2011
Publisher: Springer Berlin Heidelberg
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The blocking problem in railroad freight traffic is a tactical routing problem. The problem was modeled as an arc-based MIP in former publications. We reformulate the problem and introduce a new model. The modified objective function can be handled easier without loss of structural information. Nevertheless, real instances cannot be solved by standard algorithms. Therefore, we present a column generation approach. The model is reformulated in a path-based way. We exploit the new model structure in the pricing step. Sets of new paths for each relation are generated in polynomial time.