Manufacturing of railway locomotives and vehicles; repair of railway locomotives and vehicles; design of railway locomotives and vehicles; construction engineering; electrical installation services; manufacturing of special equipment; installation, modification and repair of special equipment; public railway transport. General items: sales of railway locomotives and vehicles; manufacturing of railway locomotive and vehicle parts; sales of railway locomotive and vehicle parts; auxiliary railway transport activities; safety technical training for special operations personnel; business training (excluding educational training, vocational skills training, etc. requiring permits); manufacturing and sales of high-speed rail equipment and accessories; sales of rail transit specialized equipment, key systems and components; development of rail transit operation management systems; manufacturing of intelligent vehicle-mounted equipment; artificial intelligence industry application system integration services; sales of artificial intelligence hardware; development of artificial intelligence application software; intelligent control system integration; research and development of intelligent robots; artificial intelligence basic resources and technology platforms; manufacturing and sales of new energy original power equipment; research and development of emerging energy technologies; battery manufacturing; battery sales; electrical equipment repair; electrical equipment sales; manufacturing of mechanical and electrical equipment; contract energy management; energy storage technical services; sales of station hydrogen refueling and hydrogen storage facilities; metal structure manufacturing; metal cutting processing services; metal product sales; motor manufacturing; motor and control system research and development; industrial robot manufacturing; industrial robot sales; industrial robot installation and maintenance; mechanical equipment research and development; general equipment repair; building materials sales; high-performance sealing material sales; high-quality special steel material sales; lubricating oil sales; coating sales (excluding hazardous chemicals); optoelectronic device sales; leasing services (excluding licensed leasing services); general cargo warehousing services (excluding hazardous chemicals and other items requiring permits); wholesale of hardware products; loading and unloading; domestic trade agency; offshore trade operations; transportation equipment leasing services; import and export of goods; technology import and export.