Manufacturing of railway rolling stock parts; property services; leasing of self-owned premises; wholesale and retail of electronic products; manufacturing of railway special equipment, accessories, and parts; manufacturing of urban rail transit equipment; manufacturing of metal structures; sales of wind turbines and accessories; manufacturing, repair, sales, and leasing of modern trolleybus parts and auto parts; sales of railway rolling stock. General items: development of rail transit operation management systems; technical services, technology development, technical consulting, technical exchange, technology transfer, and technology promotion; sales of metal materials; sales of metal products; manufacturing of specialized equipment for commerce, catering, and services; sales of building materials; production of chemical products (excluding licensed chemicals); sales of metal ores; sales of non-metallic ores and products; sales of intelligent unmanned aerial vehicles; sales of micro and special motors and components; computer system services; retail of computer software, hardware, and peripherals; system integration services; software sales; leasing of mechanical equipment; sales of mechanical equipment; sales of electronic products; sales of communication equipment; sales of environmental emergency technical equipment; urban greening management; agricultural machinery services; forestry machinery services; sales of packaging materials and products; sales of mechanical parts and components.