A Branch-and-Price algorithm for railway rolling stock rescheduling

How to best reschedule their fleet of rolling stock units during a disruption is an optimization problem regularly faced by railway operators. Despite the problem’s high complexity, it is still usually solved manually. In this paper the authors propose a path based mathematical formulation and solve it using a Branch-and-Price algorithm. The authors demonstrate that, unlike flow based approaches, the authors' formulation is more easily extended to handle certain families of constraints, such as train unit maintenance restrictions. The proposed algorithm is benchmarked on several real-life instances provided by the suburban railway operator in Copenhagen, DSB S-tog. When used in combination with a lower bound method taken from the literature the authors show that near-optimal solutions to this rescheduling problem can be found within a few seconds. Furthermore, the authors show that the proposed methodology can be used, with minor modification, on a tactical planning level, where it produces near-optimal rolling stock schedules in minutes of central processing unit (CPU) time.


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  • Accession Number: 01635470
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 25 2017 1:56PM