Maintenance, technical development, and consulting of rail transit vehicle electrical system equipment; maintenance, technical development, and consulting of rail transit signal monitoring systems, traction control systems, and management systems; sales and after-sales service of rail transit vehicle parts; manufacturing, sales, and after-sales service of electrical equipment; software research and development, sales, and after-sales service; self-operated and agency import and export of all kinds of goods and technologies. General items: manufacturing of specialized equipment for oil drilling; manufacturing of electric motors.