Which London Underground line is represented by the brown colour on the Tube map?

The Bakerloo line is represented by the brown colour on the London Underground map.

The line’s name combines Baker Street and Waterloo, the two places linked by its original route. It opened in 1906 as the Baker Street and Waterloo Railway, later becoming known simply as the Bakerloo line. Today it runs between Harrow & Wealdstone in northwest London and Elephant & Castle in south London.

The Bakerloo line is one of the Underground’s deep-level lines and is known for its distinctive 1972 Stock trains, which are among the oldest passenger trains still operating on the network. Its brown map colour is part of the standard London Underground line-colour system, which helps passengers distinguish routes even where several lines share a station. The name is sometimes misspelled “Bakerloo” with an extra vowel, but the official line name has no additional letter.