In America metro is usually short for metropolitan area (a big city and its area of influence).
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The first metro was opened in London and later most of it was soon built underground (under the city), so it was then called THE UNDERGROUND, even to this day. But in general, in the UK we usually call it THE TUBE, because it mostly goes (or went) inside a tunnel, a 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. Speakers of British English also use subway for systems in American cities and metro for systems in other European countries.
subway, also called underground, tube, or métro, underground railway system used to transport large numbers of passengers within urban and suburban areas.
In terms of strict dictionary definitions, both terms imply underground trains. Subway is a generic term, but metro is more localized to certain cities.
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.
In the UK, a 'rake of coaches / carriages' describes a set of passenger coaches pulled by a locomotive. Trains can also be described as a 'formation', particularly when both passenger and freight stock is used.
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 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.
Our number one metro overall? The Seoul Subway in South Korea topped the list. The overall ranking takes into account every element of our study - so that includes the number of stations with step-free access, the price of a ticket and the age of the system (amongst many others).