Research, development, and sales of computer information technology and software; computer technology information consulting services; transfer of computer information technology; manufacturing and processing of rail transit network control equipment and related accessories, and vehicle electronic equipment; research, development, and manufacturing of rail transit automatic control equipment, disaster prevention monitoring equipment, and system integration; wholesale and sales of electrical machinery products; self-operated and agent-imported and exported各类 commodities and technologies, excluding those restricted or prohibited by the state.