Special equipment manufacturing (excluding licensed professional equipment manufacturing); mechanical equipment research and development; urban rail transit equipment manufacturing; rail transit engineering machinery and parts sales; high-speed rail equipment and accessories manufacturing; rail transit special equipment, key systems and components sales; electronic and mechanical equipment maintenance (excluding special equipment); railway transportation auxiliary activities; small and micro passenger car leasing operation services; leasing services (excluding licensed leasing services); battery leasing; special equipment leasing; railway transportation equipment sales; high-speed rail equipment and accessories sales; electronic measuring instrument sales; hardware product retail; mechanical parts and components sales; wearable smart device sales; railway transportation infrastructure equipment sales; railway locomotive and rolling stock parts sales; railway locomotive and rolling stock sales; railway special measurement or inspection instrument sales; metal tool sales; bearings, gears and transmission components sales; gears and gear reducers and gearboxes sales; electrical equipment sales; generators and generator sets sales; battery sales; technical services, technology development, technical consultation, technical exchange, technology transfer, technology promotion; import and export agency; goods import and export.