Railway locomotive and rolling stock parts manufacturing; High-speed rail equipment and parts manufacturing; Mechanical equipment research and development; Metal processing machinery manufacturing; General equipment manufacturing (excluding special equipment manufacturing); Electrical signal equipment device manufacturing; Mechanical equipment sales; General mechanical equipment installation services; Metal structure manufacturing; Mechanical parts and components processing; Mechanical parts and components sales; Mining machinery manufacturing; Mining machinery sales; Building materials production special machinery manufacturing; Construction engineering machinery manufacturing; Construction engineering machinery sales; Non-metallic mineral material forming machinery manufacturing; Hardware product wholesale; Electrical equipment sales; Instrument and meter sales; Electronic components wholesale; Rail transit special equipment, key systems and parts sales; Rail transit engineering machinery and parts sales; Wind turbine generator sets and parts sales; Rubber product sales; Pump and vacuum equipment sales; Valve and cock sales; Bearings, gears and transmission parts sales.