Manufacturing of railway rolling stock; repair of railway rolling stock. General items: sales of rail transit engineering machinery and parts; manufacturing of urban rail transit equipment; sales of railway rolling stock parts; sales of railway rolling stock; sales of high-speed rail equipment and accessories; manufacturing of high-speed rail equipment and accessories; manufacturing of railway rolling stock parts; manufacturing of bearings, gears, and transmission components; sales of bearings; leasing of mechanical equipment; leasing of transportation equipment; manufacturing of bearings; manufacturing of molds; sales of lubricating oil; labor services (excluding labor dispatch); domestic freight forwarding; technical services, development, consulting, exchange, transfer, and promotion; repair of electrical equipment; sales of mechanical equipment; engineering technical services (excluding planning management, survey, design, and supervision); sales of electrical accessories; installation services for general mechanical equipment; repair of specialized equipment; manufacturing of automotive parts and accessories; manufacturing of power transmission and distribution and control equipment; manufacturing of metal cutting and welding equipment; manufacturing of metal chains and other metal products; technology import and export; goods import and export. (Shall not engage in business activities prohibited or restricted by national and municipal industrial policies.)