Main hall. China Railway Bureau is a department-level unit, the secretary of the director and chairman is a department-level unit, and the deputy director is a deputy department-level. China Railway 21st Bureau Group Co., Ltd. belongs to China Railway Construction Co., Ltd. under the State-owned Assets Supervision and Administration Commission of the State Council. It is a state-owned super-large construction enterprise group integrating engineering construction, survey and design, scientific research and development, real estate development, investment and financing, mineral resources development and enterprise management.