Development of rail transit operation management systems; research and development of mechanical equipment; technical services, technical development, technical consulting, technical exchange, technical transfer, and technical promotion; research and development of power distribution switchgear equipment; development of rail transit communication signal systems; research and development of motor and its control systems; fire protection technical services; software development; manufacturing of railway special measurement or inspection instruments; sales of railway special measurement or inspection instruments; manufacturing of railway locomotive and rolling stock parts; sales of railway locomotive and rolling stock parts; sales of fire protection equipment; manufacturing of security equipment; sales of security equipment; sales of building materials; sales of rail transit engineering machinery and parts; sales of railway transportation infrastructure equipment; railway transportation auxiliary activities; manufacturing of high-speed rail equipment and parts; sales of high-speed rail equipment and parts; repair of electrical equipment; sales of electrical equipment; manufacturing of electrical signal equipment devices; sales of electrical signal equipment devices; manufacturing of mechanical and electrical equipment; sales of mechanical and electrical equipment; sales of mechanical equipment; maintenance of traffic facilities; repair of special equipment; repair of general equipment; maintenance of electronic and mechanical equipment (excluding special equipment); sales of construction engineering machinery; leasing of construction engineering machinery and equipment; leasing of mechanical equipment; manufacturing of hydraulic power machinery and components; sales of hydraulic power machinery and components; wholesale of computer software and hardware and auxiliary equipment; sales of high-performance non-ferrous metals and alloy materials; sales of new metal functional materials; sales of high-quality special steel materials; repair of instruments and meters; sales of rail transit green composite materials; sales of rail transit special equipment, key systems, and components; sales of fireproof sealing materials. Licensed items: manufacturing of railway transportation infrastructure equipment; maintenance of railway locomotives and rolling stock.