The tube and the underground both refer to London's transport system--the equivalent of NY's subway or the Paris metro. Although I prefer London's.
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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.
Some speakers of British English also use subway to refer to a British railway system like this, but the London system is usually called the underground or the tube.
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.
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.
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).
In America the first metro was built in New York, and it was called SUBWAY because it was built mostly under the streets (sub= under / way= road), since Manhattan street plan is quite a regular grill and it was easy to do so. But most everywhere else they usually call it simply the TRAIN.
'Lass' or 'lassie' is another word for 'girl'. This is mainly in the north of England and Scotland. 'Lad' is another word for boy. 'Bloke' or 'chap' means 'man'. Your 'mate' or 'pal' is your friend.
The subway system is usually just referred to as the trains. Locals say I can take the train to your place to generally mean that they take the subway. The subway is never referred to as the metro, underground, or tube.
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.