London Underground
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The London Underground (often referred to as "The Tube") is London's underground railway system. Many lines in the outskirts are at or above ground level.
It is comprised of the Bakerloo, Central, Circle, District, Hammersmith & City, Jubilee, Metropolitan, Northern, Piccadilly (serves Heathrow Airport), Victoria and Waterloo & City lines.
The London underground is the oldest subway system in the world.