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Trains control network based on Train Communication Network(TCN)standard is wildly used.But due to the lack of professional error analysis tool designed especially for MVB network,it is inconvenient for locomotive condition monitoring,fault diagnosis and equipments maintenance.After investigating about MVB characteristics,a real-time MVB error analyzer(RTMEA)with USB interface system based on SOPC is proposed,which can show most useful error information referred by IEC 61375.This design also has been applied to a validation system in a real-world scenario,and it has reached the expectation of design.