Technical services, technical development, technical consulting, technical exchange, technology transfer, technology promotion; mechanical equipment R&D; high-speed rail equipment and accessories manufacturing; high-speed rail equipment and accessories sales; railway locomotive and rolling stock parts manufacturing; railway locomotive and rolling stock parts sales; transportation facility repair; electrical equipment repair; special equipment repair; electronic and mechanical equipment maintenance (excluding special equipment); power electronic components manufacturing; power electronic components sales; marine supporting equipment manufacturing; mechanical and electrical equipment manufacturing; mechanical and electrical equipment sales; power distribution switchgear equipment R&D; power distribution switchgear equipment manufacturing; power distribution switchgear equipment sales; power transmission and distribution and control equipment manufacturing; intelligent power transmission and distribution and control equipment sales; teaching special instrument manufacturing; teaching special instrument sales; instrument manufacturing; instrument sales; software development; software sales; technology import and export; goods import and export.