Abstract: According to the needs of urbanization and the development of electronic information systems, train control system develops through exploration and practice. As the basis of train control system, mobile communication network has a high reference value for train control system in aspect of its inherent development pattern and practical achievements. By studying the evolution of mobile communication network architecture from 2G to 5G, and the structure and function changes of radio access network, the evolution pattern of mobile communication network is summarized: structural flattening, function prefabrication and hardware virtualization. This pattern is used to explain the practice represented by the integration of interlocking and train control, and possible development trend is proposed, including the perception of direct connection at the execution end of decision\|making and transferring business functions on\|board.