Manufacturing of high-speed rail equipment and accessories; sales of high-speed rail equipment and accessories; manufacturing of railway locomotive and rolling stock parts; sales of railway locomotive and rolling stock parts; sales of specialized equipment, key systems, and components for rail transit; sales of special equipment; ferrous metal casting; sales of metal materials; manufacturing of bearings, gears, and transmission components; sales of bearings, gears, and transmission components; manufacturing of forgings and powder metallurgy products; sales of forgings and powder metallurgy products; manufacturing of material handling equipment; sales of intelligent material handling equipment; manufacturing of metallurgical specialized equipment; sales of metallurgical specialized equipment; sales of mechanical equipment; installation services for general mechanical equipment; maintenance of electronic and mechanical equipment (excluding special equipment); manufacturing of general equipment (excluding special equipment); steel rolling processing; manufacturing of general parts; processing of mechanical parts and components; sales of mechanical parts and components; sales of mechanical and electrical equipment; manufacturing of mechanical and electrical equipment; sales of electrical equipment; repair of electrical equipment; technical services, development, consulting, exchange, transfer, and promotion; research and development of new materials; import and export of goods; import and export of technology. Licensed items: manufacturing of special equipment; installation, renovation, and repair of special equipment; design of special equipment; electrical installation services.