Research and development, design, manufacturing, and technical services of rail transit equipment and components, electrical protection systems, process equipment automation systems, vehicle trim parts, electrical equipment boxes and electrical accessories; Software development; Manufacturing of computer hardware; Production of vehicle inspection equipment, debugging equipment, track insulation products, protective covers and accessories, cable troughs, electrical equipment boxes, and signal boxes; Sales of automotive plastic parts; Assembly of electromechanical equipment; Self-operated and agency import and export of various goods and technologies. General items: Technical services, technology development, technical consultation, technical exchange, technology transfer, and technology promotion; Sales of automobiles.