Manufacturing of locomotive and vehicle parts, cable trays, busways, low-voltage switchgear, and related product design and research and development; self-operated and agent import and export of various commodities and technologies (except for commodities and technologies restricted or prohibited by the state). General items: intelligent control system integration; rail transit engineering machinery and parts sales; rail transit special equipment, key systems and parts sales; metal structure manufacturing; special equipment repair; general equipment repair; electrical equipment repair; instrument repair.