Design, research and development, processing, manufacturing, surface treatment, welding, and repair of railway passenger cars, EMUs, urban rail vehicles and their accessories; equipment repair, maintenance, and modification; design and manufacturing of tooling and molds; research, development, and manufacturing of automated production lines, non-standard equipment, non-standard fixtures, and molds; production of automotive parts and steel structures, mechanical equipment; labor services (excluding labor dispatch and overseas labor export); house leasing.