Narrow-gauge locomotive and vehicle manufacturing; new car sales; auto parts and accessories manufacturing; auto parts wholesale; environmental protection special equipment manufacturing; environmental protection special equipment sales; construction machinery manufacturing; construction machinery sales; special equipment sales; tire sales; power electronic components sales; metal material sales; building materials sales; earthwork construction; technical services, technical development, technical consultation, technical exchange, technology transfer, and technology promotion. Permitted items: road motor vehicle production; special equipment manufacturing; import and export of goods.