Installation, maintenance, and testing of power transmission, power supply, and power receiving facilities; electrical installation services; manufacture of railway transport infrastructure equipment; repair of railway locomotives and rolling stock. General items: Manufacture of industrial automatic control system devices; sales of industrial automatic control system devices; manufacture of mechanical and electrical equipment; manufacture of metal cutting and welding equipment; manufacture of power electronic components; manufacture of power facility equipment; manufacture of electrical instrument meters; manufacture of high-speed rail equipment and parts; manufacture of railway locomotive and rolling stock parts; manufacture of bearings, gears, and transmission components; research and development of emerging energy technologies; sales of mechanical and electrical equipment; sales of metal cutting and welding equipment; sales of power electronic components; sales of power facility equipment; sales of electrical instrument meters; power generation technical services; energy storage technical services; solar power generation technical services; labor services (excluding labor dispatch); sales of intelligent power distribution and control equipment; repair of electrical equipment; sales of electrical equipment; sales of railway locomotive and rolling stock parts; sales of bearings, gears, and transmission components; sales of railway transport equipment; sales of rail transit special equipment, key systems, and components; sales of railway transport infrastructure equipment; sales of rail transit engineering machinery and parts; sales of high-speed rail equipment and parts; import and export of goods; leasing of mechanical equipment; leasing services (excluding licensed leasing services).