Manufacturing and repair of motors, electrical appliances, electronic products and accessories; manufacturing of plastic products, insulating material products, and locomotive parts; manufacturing of electrical machinery parts; machining and welding; general freight transport; self-operated export business of self-produced products and technologies; import and export of raw and auxiliary materials, instruments and meters, machinery and equipment, spare parts and technologies required for production (excluding goods and technologies restricted or prohibited by the state); operation of processing with imported materials and ‘three processing and one compensation’ businesses; technology development, transfer, consultation, and services; leasing of houses and sites; collection and payment of water and electricity fees; manufacturing, sales, maintenance and after-sales service of generators and generator sets, and rail transit vehicles.