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Optimization Model for Collaborative Overhaul Workshop Scheduling Problem of Multiple EMUs

China's high-speed railway construction is making remarkable achievements. The increasing EMUs are approaching the overhaul cycle, which has brought great pressure to the existing 7 overhaul bases. With the increasing expansion of high-speed rail network, it is of significance to reasonably arrange the maintenance plan of EMU overhaul base under the joint scheduling mode between multiple EMUs. Aiming at improving the maintenance throughput and the utilization rate of key equipment, the current overhaul bases are adopting the parallel maintenance mode of multiple EMUs. To optimize the repair process of multiple parallel mode, this paper constructed an optimization model with the goal of minimizing the invalid maintenance fragment time of key equipment, under the dual constraints of the BOM of EMU parts to be repaired and the topology of maintenance process. In view of the nonlinearity of the model, the topology diagram of cooperative advanced repair of multiple EMUs was constructed, and then the max-min ant colony algorithm was designed to optimize the model, so as to obtain the optimal solution of the model. The model and algorithms were validated by an actual problem of the overhaul (Level 3) process of multiple EMUs.