In the train communication network, WTB and MVB were the main communication modes. Based on the research and development of a power centralized EMUs, the train bus control mode based on MVB and Ethernet was studied. The redundant switching function of the dual line of control unit was added to the locomotive application, which enhanced the reliability of train network. The application test showed that the communication network with this scheme has a good running state with high reliability and real time, and fully meets the requirements of the train data transmission.