Through building the wagon loading base, driving train of the 10 000 t and composite train, enlarging the size and increasing the load, shortening the time of breaking- off, constructing the special freight line, normalizing the location of production, increasing the receiving and unloading ability, innovating the model of dispatching organization, and strengthening the train management, etc.

This paper introduces the technical specifications,the main performance and the necessity for classification expanding of Beijing metro Ba-Tong Line,discusses the technical route for train expanding,including equipment supply,configurations and design principles etc.