Railway rolling stock design; railway rolling stock manufacturing; railway rolling stock maintenance; import of new railway rolling stock; import and export of state-traded goods; construction engineering construction; construction engineering design; electrical installation services. General items: railway rolling stock sales; railway rolling stock parts and accessories manufacturing; railway rolling stock parts and accessories sales; high-speed rail equipment and parts manufacturing; high-speed rail equipment and parts sales; urban rail transit equipment manufacturing; rail transit-specific equipment, key systems and components sales; technical services, technical development, technical consulting, technical exchange, technology transfer, technology promotion; goods import and export; technology import and export; import and export agency; customs declaration services; inspection declaration services; foreign project contracting; engineering management services; machinery and equipment leasing; transportation equipment leasing services; non-residential real estate leasing; land use rights leasing; leasing services (excluding licensed leasing services); cork product sales; cork product manufacturing; wooden container manufacturing; forging and powder metallurgy product manufacturing; forging and powder metallurgy product sales; chemical product sales (excluding licensed chemical products); specialty chemical product sales (excluding hazardous chemicals); basic chemical raw material manufacturing (excluding manufacturing of licensed chemicals such as hazardous chemicals); business training (excluding training requiring licenses such as education and vocational skills training); human resources services (excluding intermediary activities and labor dispatch); mechanical equipment research and development; mechanical equipment sales; general mechanical equipment installation services; general equipment manufacturing (excluding special equipment manufacturing); general equipment repair; electronic and mechanical equipment maintenance (excluding special equipment); electrical equipment sales; special equipment manufacturing (excluding licensed special equipment manufacturing); industrial control computers and system sales; industrial control computers and system manufacturing; information system integration services; information technology consulting services; software development; information system operation and maintenance services; big data services; blockchain technology-related software and services; automobile sales; building materials sales; lubricating oil sales.