Research, development, production, processing, and sales of railway rolling stock parts, urban rail transit equipment and parts, railway special equipment and accessories, and railway transport equipment; provision of technical services and leasing services for railway rolling stock parts, urban rail transit equipment and parts, railway special equipment and accessories, and railway transport equipment; repair of railway rolling stock parts and railway transport equipment; real estate leasing operations; trade agency; import and export of goods and technologies (excluding those prohibited or subject to administrative approval by the state).