Network Rail Limited, together with its subsidiaries, engages in the development, operation, and maintenance of rail tracks, signaling systems, rail bridges, tunnels, level crossings, viaducts, and railway stations in the Great Britain. It involves the provision of railway track access to train operators; management of train timetabling, train planning, and signalling; and maintenance, renewal, and enhancement of the infrastructure. The company also leases railway arches, offices, shops, restaurants, leisure units, and light industrial units to small and medium sized businesses; and provides support services to operators to provide freight services. Network Rail Limited operates and maintains 20,000 miles of track and infrastructure; 40,000 bridges and tunnels; 18 stations; and 8,200 commercial properties, as well as leases 2,500 stations to train operators. The company was founded in 2002 and is based in London, the United Kingdom.