Mainly engaged in manufacturing of special equipment; Installation, renovation and repair of special equipment; Maintenance of rolling stock; Construction labor subcontracting; Engineering construction (for projects that must be approved according to law, business activities can be carried out only after the approval of relevant departments, and the specific business projects shall be subject to the approval documents or certificates of relevant departments). General projects: general equipment manufacturing (excluding special equipment manufacturing); Sales of special equipment; Sales of lubricating oil; Sales of railway transportation equipment; Manufacturing of railway vehicle parts; Sales of railway vehicle parts; Railway auxiliary activities; Manufacturing of material handling equipment; Sales of material handling equipment; Sales of coatings (excluding hazardous chemicals); Handling;