Research, development, manufacturing, and sales of various motors, motor drive control systems, explosion-proof electrical equipment, rail vehicle air conditioning equipment, traction converters, auxiliary converters, chargers, traction drive control systems, and steel-aluminum composite contact rails for power supply systems; Software development and system integration services for rail transit vehicles; Sales of self-produced products; Provision of installation, maintenance, technical consulting services, and technology transfer for the above products; Self-operated and agent import and export of various commodities and technologies, except those restricted or prohibited by the state. General items: Rail transit communication signal system development; Electrical signal equipment device manufacturing; Electrical signal equipment device sales; Integrated circuit manufacturing; Integrated circuit design; Integrated circuit sales; Industrial control computer and system sales; Industrial control computer and system manufacturing; Automotive parts and accessory manufacturing; Automotive parts research and development; New energy vehicle electrical accessory sales; Intelligent vehicle equipment manufacturing; Intelligent vehicle equipment sales; Industrial automatic control system device manufacturing; Industrial automatic control system device sales; Special equipment sales; Technical services, technical development, technical consulting, technical exchange, technology transfer, and technology promotion; Mechanical and electrical equipment manufacturing; Mechanical and electrical equipment sales; Rail transit special equipment, key systems, and component sales; Transformer, rectifier, and inductor manufacturing; Energy storage technical services; Battery parts production; Battery parts sales; Photovoltaic equipment and component manufacturing; Photovoltaic equipment and component sales; Advanced power electronic device sales.