Tianjin South Ring Railway Co., Ltd. is a joint venture railway company with Beijing Railway Bureau and Tianjin Railway Investment Company. It is managed by Beijing Railway Bureau, so it has something to do with Beijing Railway Bureau.
Tianjin South Ring Railway Co., Ltd. Electric Company is the former Tianjin Railway Group Company, which is responsible for the maintenance and management of power, signal and communication of all lines within the management scope of South Ring Railway Company.