Research, development, design, manufacturing, installation, and technical services for key components of transportation equipment (control systems, rolling stock parts) and passenger service facilities and equipment (lighting systems, subway platform screen doors, decorative materials, plastic products) for high-speed railways, dedicated passenger railway lines, intercity railways, mainline railways, and urban rail transit; research, development, design, manufacturing, installation, and technical services for rail transit communication signal systems and equipment, electrified railway equipment and materials (disaster monitoring equipment and system integration, rail transit automatic control equipment, lighting systems); design, manufacturing, and installation of power station specialized equipment and accessories (rotary trash rakes, rake-type trash rakes, trash racks, flat steel gates and other hydraulic metal structure products), hoisting machinery, valves and valve actuators, and metal structural parts; information services, rail transit technology development, technology transfer; sales of self-produced products. Design, installation, and after-sales service for light boxes and advertising facilities (excluding advertising business); domestic procurement, wholesale, commission agency (excluding auctions), import and export, and related supporting businesses of rail vehicles and their parts (excluding state-managed trade commodities; for commodities subject to quota or license management, handle according to relevant national regulations); road ordinary freight transport; rail transit technology training for adults (excluding nationally recognized vocational certificate training). Licensed items: Construction engineering construction; specialized construction operations; electrical installation services. General items: Sales of mechanical parts and components; manufacturing of mechanical and electrical equipment; sales of mechanical and electrical equipment; leasing of mechanical equipment; leasing of non-residential real estate; leasing of land use rights; leasing services (excluding licensed leasing services); property management.