The Circle line is one of London's most historic and useful routes, forming a near-circular loop through central London that connects most of the city's major mainline railway termini - Paddington, Edgware Road, King's Cross, Farringdon, Liverpool Street, Aldgate, Cannon Street, Blackfriars, Victoria and Sloane Square. Despite its name, the Circle line is not a true circle - since 2009 it has operated as a spiral, extending to Hammersmith at its western end. Its 27 stations cover 27 km and pass through some of the oldest and most historically significant parts of central London. The distinctive yellow colour makes it easy to spot on the map, and its usefulness as a cross-London connector makes it one of the most-used lines for single-journey trips.
The Circle line's route was completed in 1884 after years of construction by the Metropolitan Railway and the Metropolitan District Railway, who cooperated - often acrimoniously - to build a continuous inner circuit. The original steam-operated trains made conditions underground notoriously unpleasant. The line was electrified in 1905 and has been progressively modernised since. For most of its existence it operated as a true loop with trains circling endlessly, but in 2009 TfL extended the service to Hammersmith, turning it into a spiral route with trains beginning and ending at Hammersmith.
32 stops along the route
Everything you need to know about the Circle Line in London.