Railway engineering; Level III professional contracting for railway signaling and communication engineering; Construction engineering; Locomotive and rolling stock maintenance (limited to TISCO); Sales and maintenance of railway and railway signaling and communication specialized equipment and materials; Sales of rail transit equipment and spare parts; Manufacturing and sales of railway track spare parts (screw spikes, track spikes, nylon seats); Manufacturing and sales of concrete crossing slabs; Road freight transport; Railway transport; Railway transport agency services; Logistics auxiliary services; Railway freight yard station services; Platform operation; Sales of iron ore powder, stone slag, pig iron, bauxite, aluminum ingots, bentonite, steel products, and agricultural and sideline products; Wagon planning; Railway technology research and development and consulting; Cargo loading and unloading; Crossing guard services; Provision of labor services for TISCO.