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The maintenance capacity of EMU depot(EMUD) not only depends on facilities such as washing tracks and maintenance tracks, but also depends on the EMU circulation plan(ECP). The first-level maintenance of EMU is the most usual one and is almost during night as the special situation of ECP in China, which makes it the key factor of improving EMU operation efficiency and the first-level maintenance capacity of EMUD an essential constraint of the ECP and the timetable. This paper transformed the original problem into flow-shop scheduling problem to establish the integer programming models with ECP as time constraints, and with maximum quantity of EMUs which can be maintained before deadline as the objective function, then used the genetic algorithm to calculate the model. Finally, it was validated by an example in some certain EMUDs of Beijing-Shanghai high-speed railway that the model and algorithm could obtain favorable results for the problem.

Calculation of First-Level Maintenance Capacity in EMU Depot Based on the EMU Circulation Plan