[Objective]Re-coupling operation mode can ef-fectively improve the matching degree between the passenger flow and the transport capacity of urban rail transit,while it al-so poses challenges to the formulation of the train stock utiliza-tion plan.Therefore,it is necessary to conduct research on the connection between the train stock and different marshalling train trips under this mode.[Method]By analyzing the cha-racteristics of urban rail transit train stock utilization under the re-coupling operation mode and the connection situation of the train stock during the transition period from peak to off-peak passenger flow,aiming at minimizing the number of train stock in use and the connection time cost,and ensuring the balance of train stock utilization,relevant constraints such as the u-niqueness of train service connection,the consistency of train stock,maintenance plans,regular node connections,and con-nection of coupled train service nodes are comprehensively con-sidered.The MTSP(multiple traveling salesman problem)is introduced to construct an optimized train stock utilization mod-el during the transition period from peak to off-peak passenger flow in urban rail transit.Moreover,a MOFA(multi-objective firefly algorithm)based on MCS(multiply cooperative strate-gies)is designed.In the case study of a certain urban rail tran-sit line with significant imbalance of passenger flow in different periods,the feasibility and rationality of the above optimized model are verified.[Result & Conclusion]The optimized train stock utilization scheme of urban rail transit under the re-coupling operation mode can reasonably optimize the connec-tion between different marshalling train trips and reduce the op-eration costs for enterprises.
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