Manufacturing of industrial automatic control system devices; sales of industrial automatic control system devices; manufacturing of narrow-gauge rolling stock; sales of railway rolling stock; development of rail transit operation management systems; development of rail transit communication and signal systems; sales of rail transit specialized equipment, key systems, and components; sales of rail transit engineering machinery and components; manufacturing of specialized machinery for tunnel construction; sales of specialized machinery for tunnel construction; manufacturing of mining machinery; sales of mining machinery; manufacturing of construction engineering machinery; sales of construction engineering machinery; leasing of construction engineering machinery and equipment; manufacturing of power transmission and distribution and control equipment; sales of intelligent power transmission and distribution and control equipment; sales of special equipment; manufacturing of batteries; sales of batteries; manufacturing of daily-use sundries; sales of daily-use sundries; leasing services (excluding licensed leasing services); industrial design services; repair of specialized equipment; repair of general equipment; repair of electrical equipment; installation services for general mechanical equipment; technology intermediary services; technical services, technology development, technical consultation, technology exchange, technology transfer, and technology promotion; import and export of goods; import and export of technology; import and export agency; sales of metal materials; wholesale of hardware products; sales of electronic products; operation of wires and cables. Licensed items: manufacturing of railway rolling stock; repair of railway rolling stock; manufacturing of special equipment; installation, renovation, and repair of special equipment; design of special equipment; construction engineering construction; construction engineering design; road cargo transport (excluding dangerous goods); electrical installation services.