Design, manufacturing, and installation of trams, trolleybuses, engineering vehicles and their parts, electric vehicles, and complete tram engineering equipment; technology transfer and consulting services; development and manufacturing of electrical, electronic technology, mechatronics, mechanical products, and automation control technology products; design and manufacturing of railway steam locomotives, battery electric locomotives, electric multiple units, and amusement equipment; railway engineering design and construction; leasing of self-owned properties; export business of self-produced products and technologies, and import business of required machinery, equipment, spare parts, raw materials, and technologies (excluding goods and technologies restricted or prohibited by the state).