How many bureaus does China Railway always have? Where are they all?

The head office has 3 1 member enterprises, mainly China Overseas Engineering Corporation, China Railway No.1 Bureau, No.2 Bureau, No.3 Bureau, No.4 Bureau, No.5 Bureau, No.6 Bureau, No.7 Bureau, No.8 Bureau, No.9 Bureau, No.10 Bureau, Bridge Bureau, Electrification Bureau, Tunnel and Construction Engineering Group 14 super-large construction enterprises. Four large-scale and super-large-scale survey and design enterprises, such as the Second and Third Railway Survey and Design Institute, China Railway Engineering Design Consulting Group and China Railway Bridge Survey and Design Institute Co., Ltd., three large-scale scientific and technological research and development enterprises, four large-scale industrial manufacturing enterprises, such as China Railway Bridge, Baoqiao, Baogong and Wugong, Hengping Trust and Investment Co., Ltd., and four directly affiliated units and 17 branches and companies. Construction teams are distributed in all provinces, cities and autonomous regions 1000 counties and cities in China except Taiwan Province Province.