Design of building intelligent systems; design of construction engineering; construction of construction engineering; interior decoration; maintenance of railway locomotives and rolling stock; installation, modification, and repair of special equipment; inspection and testing of special equipment; inspection of lightning protection devices; labor dispatch services; occupational intermediary activities; surveying and mapping services. General items: development of rail transit operation management systems; sales of rail transit engineering machinery and parts; sales of rail transit special equipment, key systems, and parts; domestic freight transport agency; railway transport auxiliary activities; loading and unloading handling; manufacturing of mechanical and electrical equipment; maintenance of electronic and mechanical equipment (excluding special equipment); repair of electrical equipment; repair of general equipment; sales of mechanical equipment; sales of mechanical and electrical equipment; sales of electrical equipment; sales of refrigeration and air conditioning equipment; sales of electronic products; sales of photovoltaic equipment and components; sales of intelligent power distribution and control equipment; wholesale of computer software, hardware, and auxiliary equipment; sales of railway locomotive and rolling stock parts; sales of railway transport infrastructure equipment; sales of special equipment; sales of high-speed rail equipment and accessories; sales of metal materials; sales of building materials; sales of chemical products (excluding licensed hazardous chemicals); sales of lubricating oil; sales of railway special measuring or testing instruments; leasing of mechanical equipment; design and construction services for security technical prevention systems; system integration services; advertising publication; advertising design and agency; human resources services (excluding occupational intermediary and labor dispatch); property management; installation services for general mechanical equipment; technical services, technical development, technical consulting, technical exchange, technology transfer, and technology promotion; solar power generation technical services; non-residential real estate leasing; residential leasing.