Manufacture of railway locomotive and rolling stock parts; manufacture of narrow-gauge locomotives and rolling stock; sales of railway locomotive and rolling stock parts; sales of railway locomotives and rolling stock; sales of specialized equipment, key systems, and components for rail transit; sales of railway transport equipment; sales of rail transit engineering machinery and parts; processing of mechanical parts and components; manufacture of gears, gear reducers, and gearboxes; sales of new energy prime mover equipment; manufacture of new energy prime mover equipment; sales of mechanical parts and components; sales of mechanical and electrical equipment; sales of power electronic components; sales of gears, gear reducers, and gearboxes; sales of bearings; import and export of goods; sales of bearings, gears, and transmission components; manufacture of bearings, gears, and transmission components; manufacture of mining machinery. Licensed items: design of railway locomotives and rolling stock; maintenance of railway locomotives and rolling stock; manufacture of railway locomotives and rolling stock; manufacture of railway transport infrastructure equipment.