British/American underground / subway / metro / tube. 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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London Underground, also called the Tube, underground railway system that services the London metropolitan area.
Glasgow, though it is in Britain, uses the word subway, but in the rest of Great Britain subway is an underground passage for pedestrians (to cross under a road or street). In America metro is usually short for metropolitan area (a big city and its area of influence).
What is an underground train called in the UK? Usually (especially in London) people generally call it “the tube” though there are many specific lines.
London has a famous underground railway system which we locals call the 'Tube'. This is because many of the tunnels are a round tube shape. Although people call it the 'Underground' or 'Tube', half of the stations are actually above the ground.
The TubeLondon is vastly inter-connected, quite unlike anywhere else in the world, with an expansive, sprawling underground system which, though technically called The London Underground, is locally known as “the tube”.
Now in service alongside the London Underground, it has several notable differences that set it apart from the Tube, from the trains themselves to the line's operation. First and foremost, it is not a 'tube line' – it is a regular national railway line.
The Tube is a slang name for the London Underground, because the tunnels for some of the lines are round tubes running through the ground. The Underground serves 270 stations and over 408 km of track. From 2006 to 2007 over 1 billion passengers used the underground.