Research on teaching equipment; development of software; research and development of electronic technology; production and processing of electronically controlled teaching and training equipment; manufacture of railway specialized equipment and materials, accessories, teaching models and teaching aids, urban rail transit equipment, metal processing machinery, general parts, and molds; computer technology development and technical services; computer network system engineering services; design services for mechanical engineering, electronic engineering, and railway engineering; maintenance and repair of rail transit locomotives, vehicles, and equipment; construction of traffic facilities; installation of traffic facilities; house decoration; sales of teaching instruments, multimedia systems, computers, computer software, and electronically controlled teaching and training equipment; import or export of goods and technologies (excluding those prohibited or subject to administrative approval by the state); self-operated and agency import and export of various commodities and technologies, except for commodities and technologies restricted or prohibited by the state; house leasing; leasing of own factory buildings.