What is another word for the tube?
Pronunciation: [ðə tjˈuːb] (IPA) 
The phrase "the tube" is commonly used in the UK to refer to the London Underground, but there are also many other phrases that can be used interchangeably. Some of these include "the subway," which is commonly used in the United States, and "the metro" or "the underground," which are used in many other countries. Other slang terms for the Underground include "the Tube network," "the TFL," and "the London Transport system." While these phrases may differ slightly in meaning, they all refer to the same network of underground trains that run throughout London, transporting millions of commuters and visitors every day.
