The majority of Network Rail lines also carry freight traffic; some lines are freight only. A few lines that carry passenger traffic are not part of the National Rail network (such as the Tyne and Wear Metro and the London Underground).
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The current operator, London Underground Limited (LUL), is a wholly owned subsidiary of Transport for London (TfL), the statutory corporation responsible for the transport network in London.
Operated by MTR Elizabeth line (MTREL), a 100% subsidiary of MTR Corporation, the Elizabeth line is part of the TfL network and has interchanges with the London Underground, DLR, London Overground and National Rail services.
The United States possesses the largest railway network in the world, in terms of total operating length. China and India trail behind as the second and third largest railway networks respectively. Detailed profiles of the top five railway networks worldwide, taking into consideration their extensive coverage.
According to the statistics portal Statista, Union Pacific of the USA is worth a massive $75.4 billion, making it comfortably the biggest rail company in the world.