Technical services, technical development, technical consulting, technical exchange, technology transfer, and technology promotion; Manufacture of specialized equipment for traffic safety and control; Manufacture of electrical signal device equipment; Research and development of new material technologies; Sale of specialized equipment, key systems, and components for rail transit; Sale of green composite materials for rail transit; Sale of traffic and public management signs; Sale of high-speed rail equipment and accessories; Sale of railway locomotive and rolling stock parts; Sale of electrical signal device equipment; Manufacture of rubber products; Sale of rubber products; Manufacture of plastic products; Sale of plastic products; Manufacture of synthetic materials (excluding hazardous chemicals); Sale of synthetic materials; Manufacture of tires; Sale of tires; Sale of high-quality synthetic rubber; Plastic surface treatment; Sale of software; Internet sales (excluding goods requiring sales permits); Sale of electrical equipment; Maintenance of traffic facilities; Installation services for general mechanical equipment; Recycling of renewable resources (excluding production scrap metal); Processing of renewable resources; Sale of renewable resources; Sale of specialized chemical products (excluding hazardous chemicals); Sale of high-quality special steel materials; Sale of metal structures; Sale of metal materials; Sale of metal products. Licensed items: Import and export of goods; Import and export of technology.