Which company built the high-speed rail?

China Railway Design Group Co., Ltd., China Communications Group, China Railway First Bureau, etc. China's high-speed railways are all built by China Railway Design Group Co., Ltd., China Communications Group, China Railway No.1 Bureau, No.2 Bureau, No.3 Bureau and No.4 Institute. , but it depends on the winning bid, and it is not a fixed company. No matter whether the high-speed rail construction project in China is invested by the state or the private sector, China Railway Corporation has the motivation to implement EPC general contracting mode, and China Railway Design Group will naturally become the core platform for China Railway Corporation to undertake railway construction projects.