The Tube is a colloquial name for the London Underground, London's metro system. The underground railway has been described as the tube since 1890 when the first electric railway line running through deep-level tunnels was opened. Specific lines also have their own nicknames; the most widely used is the Waterloo and City Line's "The Drain".

Other meanings

The Tube was an innovative United Kingdom music television programme of the 1980s.

The Tube is also a colloquial name for television, especially in the UK. It arose because a cathode ray tube is the major component in non-LCD television sets.