Technology import and export; goods import and export; maintenance of railway rolling stock. General items: sales of specialized equipment, key systems, and components for rail transit; manufacturing of high-speed rail equipment and accessories; sales of high-speed rail equipment and accessories; manufacturing of railway rolling stock parts and accessories; sales of railway rolling stock parts and accessories; technical services, technology development, technical consulting, technology exchange, technology transfer, and technology promotion; manufacturing of environmental protection specialized equipment; sales of environmental protection specialized equipment; metal surface treatment and heat treatment processing; promotion services for new material technologies; manufacturing of industrial textiles; sales of industrial textiles; leasing of non-residential real estate; leasing of machinery and equipment; leasing of computers and communication equipment; leasing of transportation equipment; leasing of office equipment; leasing of photovoltaic power generation equipment; leasing of storage equipment; leasing of special equipment; sales of plastic products; manufacturing of plastic products; sales of metal materials; processing of mechanical parts and components; sales of mechanical parts and components; manufacturing of automotive parts and accessories; wholesale of automotive parts; manufacturing of specialized equipment (excluding licensed specialized equipment); manufacturing of lighting fixtures; sales of lighting fixtures.