Add to ORKGInternational audienceTrack maintenance is implemented to maintain track quality to ensure railway safety. Delayedrepair is a specific problem in track maintenance due to the long distance travelling or the limitation ofthe maintenance tool. We want to assess the effects of delayed repairs on maintenance performance andtake them into account for track maintenance decision, especially for the condition based maintenance.In this paper, a Coloured Petri Net (CPN) model is proposed to evaluate the delayed maintenance basedon track condition for the given repair delays. This model can investigate the effects of the delays andoptimize the maintenance decisions.Monte Carlo simulations are performed for different maintenance configurations. The sim...