Development, production, and sales of locomotive and rolling stock parts, locomotive electronic and network control equipment, train tail safety protection devices and auxiliary equipment; Software development and sales; Information system integration; Sales of mechanical equipment, metal materials (excluding precious and rare metals), building materials, general electromechanical equipment, and hardware tools; Installation of electromechanical, hydropower, and HVAC equipment; Building installation and decoration; Repair of railway transport equipment and railway locomotive and rolling stock equipment.