The Engineering Machinery Section of China Railway Administration is a grassroots unit of the railway system, responsible for the maintenance and repair of railway lines and bridge and tunnel equipment. The engineering section implements a three-level management system of section, workshop, and team, with several specialized workshops including line workshops, bridge workshops, key maintenance workshops, comprehensive machine repair workshops, transportation workshops, etc. The section department has several professional departments including line technology, safety, bridge and tunnel technology, and the line workshop is responsible for the daily maintenance and repair of railway lines and related equipment. Key maintenance workshop: responsible for the large and medium-sized maintenance construction operations of railway lines. Comprehensive machine repair workshop: responsible for machine maintenance, accessory repair, auxiliary processing, etc. Each workshop is equipped with