CREC consists of 31 member enterprises including:

- 16 super-large construction enterprises

• China National Overseas Engineering Corporation
• China Railway Resources Co., Ltd.
• China Railway First Group Corporation
• China Railway Erju Group Corporation (China Railway Second Group Corporation)
• Third Engineering Group Co. Ltd
• China Tiesiju Civil Engineering Group Co. Ltd (China Fourth Group Civil Engineering Group Co. Ltd)
• China Railway Wuju Group Corporation (China Railway Fifth Group Corporation)
• China Railway Sixth Group Co. Ltd
• China Railway Seventh Group Co. Ltd
• China Railway Eighth Civil Engineering Group Corporation
• China Railway No. 9 Group Co. Ltd
• China Railway No. 10 Group Corporation
• China Zhongtie Major Bridge Engineering Group Co. Ltd (China Railway Major Bridge Engineering Group Co. Ltd)
• China Railway Tunnel Group
• China Railway Electrification Bureau Co. Ltd
• China Railway Construction Engineering Group

- 3 large or super large surveying and designing enterprises

• Second Survey and Design Institute of China Railway
• China Railway Engineering Consultants Group
• China Major Bridge Survey and Design Institute

- 3 large R&D enterprises

• Northwest Research Institute
• Southwest Research Institute of CREC
• Engineering Machinery Research and Design Institute

- 5 large manufacturing enterprises

• China Railway Shanhaiguan Bridge Group Co. Ltd
• China Railway Turnout Bridge Inc.
• China Railway Bus. Co. Ltd.
• Wuhan Engineering Machinery Works of CREC
• Hengping Trust and Investment Co. Ltd.

In addition there are 4 organizations directly run by the Headquarters and 17 subsidiary companies and project companies. CREC's construction teams are found in over 1,000 cities throughout China except Taiwan Province (now administrated by the Republic of China).