Manufacturing of railway locomotive and rolling stock parts; sales of railway locomotive and rolling stock parts; sales of railway locomotives and rolling stock; manufacturing of specialized railway measuring or testing instruments; sales of railway transportation infrastructure equipment; sales of specialized rail transit equipment, key systems, and components; manufacturing of high-speed rail equipment and parts; sales of high-speed rail equipment and parts; sales of rail transit engineering machinery and components; auxiliary activities for railway transportation; development of rail transit operation management systems; development of rail transit communication and signaling systems; software development; technical services, technical development, technical consulting, technical exchange, technology transfer, and technology promotion; manufacturing of rubber products; sales of rubber products; sales of household appliances; sales of lighting fixtures; sales of generators and generator sets; sales of digital video surveillance systems; sales of mechanical and electrical equipment; repair of electrical equipment; repair of specialized equipment; repair of general equipment; sales of security equipment; sales of fire-fighting equipment; installation services for general mechanical equipment; labor services (excluding labor dispatch); import and export of goods; import and export of technologies.