A city's underground railway system is usually called the underground (often the Underground) in British English and the subway in North American English.
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The London Underground is often called the Tube because of the shape of the tunnels. The London Underground is one of the oldest metro systems in the world, opening in 1863. When the Central Line Railway opened in 1900, it was called the Twopenny Tube, referencing the price of a ticket.
In terms of strict dictionary definitions, both terms imply underground trains. Subway is a generic term, but metro is more localized to certain cities. Subway is generally used for underground train systems and metro for above ground.
Since then the Underground network, affectionately nicknamed the Tube by generations of Londoners, has grown to 272 stations and 11 lines stretching deep into the Capital's suburbs and beyond.
THE world's first metro, now the world's oldest system, is the London Underground in England, which is more commonly known as the Tube, which was opened in 1863. At 402 kilometers in length the London Underground is also the world's second longest metro system.
The Shanghai Metro is the world's longest metro network at 803 kilometres (499 mi) and has the highest annual ridership at 2.83 billion trips. The New York City Subway has the greatest number of stations with 472.
The London Underground (also known simply as the Underground or by its nickname the Tube) is a rapid transit system serving Greater London and some parts of the adjacent home counties of Buckinghamshire, Essex and Hertfordshire in England.
Opening in 1863 as Metropolitan Railway, the Metropolitan line includes the oldest underground railway in the world and starting the whole of the London Underground network.