Research, development, manufacturing, and sales of general mechanical equipment and parts, electrical machinery and equipment, cutting tools, and valves; manufacturing and sales of locomotive and rolling stock parts, electronic products, tooling and molds; sales of metal materials; transfer and import/export business of rail transit and mechanical equipment manufacturing technology; manufacturing and sales of metal parts for railway tracks and bridges; solar cells and parts; manufacturing of industrial automatic control system devices, lighting fixtures, lamp electrical accessories, and other lighting appliances; sales of industrial automation equipment and solar street lights; research and development of industrial automation equipment; manufacturing of automotive parts and accessories (excluding automobile engine manufacturing).