Rail transit special equipment, key systems and components sales; rail transit communication signal system development; urban rail transit equipment manufacturing; rail transit green composite materials sales; rail transit engineering machinery and parts sales; railway transportation infrastructure equipment sales; high-speed rail equipment and accessories manufacturing; high-speed rail equipment and accessories sales; railway special measuring or testing instrument manufacturing; railway special measuring or testing instrument sales; electrical signal equipment device manufacturing; electrical signal equipment device sales; railway transportation equipment sales; specialized equipment manufacturing (excluding licensed specialized equipment manufacturing); software development; software sales; technical services, technical development, technical consulting, technical exchange, technology transfer, technology promotion; information system integration services; information technology consulting services; power distribution switchgear equipment research and development; power distribution switchgear equipment manufacturing; power distribution switchgear equipment sales; general equipment repair; general equipment manufacturing (excluding special equipment manufacturing); communication equipment manufacturing; general parts manufacturing; mechanical equipment research and development; mechanical equipment sales; communication equipment sales; general mechanical equipment installation services; foreign contracted projects; railway rolling stock parts sales; computer software and hardware and auxiliary equipment retail; instrument manufacturing; instrument sales; instrument repair.