Specialized construction operations; installation, maintenance, and testing of power transmission, supply, and receiving facilities. General items: manufacturing of urban rail transit equipment; manufacturing of railway locomotive and rolling stock parts; sales of railway locomotive and rolling stock parts; sales of rail transit green composite materials; manufacturing of high-performance fibers and composite materials; sales of high-performance fibers and composite materials; research and development of new material technologies; sales of glass fiber and products; metal surface treatment and heat treatment processing; manufacturing of general equipment (excluding special equipment); leasing of machinery and equipment; leasing services (excluding licensed leasing services); leasing of non-residential real estate; manufacturing of transformers, rectifiers, and inductors; manufacturing of power transmission, transformation, and distribution monitoring and control equipment; sales of power transmission, transformation, and distribution monitoring and control equipment; manufacturing of power distribution switchgear equipment; sales of power distribution switchgear equipment; manufacturing of power electronic components; sales of power electronic components; operation of wires and cables; research and development of emerging energy technologies; labor services (excluding labor dispatch); import and export of goods.