If TSW 2 did not announce the Bakerloo Line, what line would you want the Underground to be? The Bakerloo line is a London Underground line that runs between Harrow & Wealdstone in suburban north-west London and Elephant & Castle in south London, via the West End. Coloured brown on the Tube map, it serves 25 stations, of which 15 are below ground, over 14.4 miles (23.2 km). It runs partly on the surface and partly at deep level. The Central line is a London Underground line that runs through central London, from Epping, Essex, in the north-east to Ealing Broadway and West Ruislip in the west. Coloured red on the Tube map, the line serves 49 stations over 46 miles (74 km). It is one of only two lines on the Underground network to cross the Greater London boundary, the other being the Metropolitan. One of London's deep-level railways, Central line trains are smaller than those on British main lines. The Circle line is a London Underground line in a spiralling shape, running from Hammersmith in the west to Edgware Road and then looping around central London back to Edgware Road. The railway is below ground in the central section and on the loop east of Paddington. Unlike London's deep-level lines, the Circle line tunnels are just below the surface and are of similar size to those on British main lines. Coloured yellow on the Tube map, the 17-mile (27 km) line serves 36 stations, including most of London's main line termini. Almost all of the route, and all the stations, are shared with one or more of the three other sub-surface lines, namely the District, Hammersmith and City and Metropolitan line. The District line is a London Underground line that runs from Upminster in the east to Earl's Court in west London, where it splits into a number of branches. One branch runs to Wimbledon in south-west London and one runs north to Edgware Road. A short branch said to be weekends only runs for one stop to Kensington (Olympia), although in fact there are some very limited weekday services, two in the evening out and a number of early morning journeys which commence out of service from Lillie Bridge Depot. The main route continues west from Earl's Court to Turnham Green after which it divides again into two western branches, to Richmond and Ealing Boardway. Coloured green on the Tube map, the line serves 60 stations over 40 miles (64 km). It is the only Underground line to use a bridge to traverse the River Thames, crossing on both the Wimbledon and Richmond branches. The Hammersmith & City line is a London Underground line that runs between Hammersmith in west London and Barking in East London. Coloured pink on the Tube map, it serves 29 stations over 15.8 miles (25.5 km). Between Farringdon and Aldgate East it skirts the City of London, the capital's financial heart, hence the line's name. Its tunnels are just below the surface and are a similar size to those on British main lines. The Jubilee line is a London Underground line that runs between Stratford in east London and Stanmore in the suburban north-west, via the Docklands, South Bank and West End. Opened in 1979, it is the newest line on the network, although some sections of track date back to 1932 and some stations to 1879. Coloured silver on the Tube map and has 27 stations. The Metropolitan line, colloquially known as the Met, is a London Underground line between Aldgate in the City of London and Amersham and Chesham in Buckinghamshire, with branches to Watford in Hertfordshire and Uxbridge in Hillingdon. Coloured magenta on the Tube map, the line is 41.4 miles (66.7 km) in length and serves 34 stations. Between Aldgate and Finchley Road the track is mostly in shallow "cut and cover" tunnels, apart from short sections at Barbican and Farringdon stations. The rest of the line is above ground, with a loading gauge of a similar size to those on main lines. Just under 67 million passenger journeys were made on the line in 2011/12. The Northern line is a London Underground line that runs from south-west to north-west London, with two branches through central London and three in north London. It runs northwards from its southern terminus at Morden in the borough of Merton to Kennington in Southwark, where it divides into two central branches, one via Charing Cross in the West End and the other via Bank in the City. The central branches re-join at Camden Town where the line again divides into two branches, one to High Barnet and the other to Edgware in the borough of Barnet. The High Barnet branch has an additional single-station spur at Finchley Central with a shuttle train to Mill Hill East. For most of its length it is a deep-level tube line. There are 50 stations in total on the line, of which 36 have platforms below ground. The Piccadilly line is a London Underground line that runs between Cockfosters in suburban north London and Acton Town in the west, where it divides into two branches: one of these runs to Heathrow Airport and the other to Uxbridge in northwest London, with some services terminating at Rayners Lane. Coloured dark blue on the Tube map, it is the fourth-busiest line on the Underground network with over 210 million passenger journeys in 2011/12. It has 53 station. The Victoria line is a London Underground line that runs between Brixton in south London and Walthamstow Central in the north-east, via the West End. It is coloured light blue on the Tube map and is one of the only two lines on the network to run completely underground, the other being the Waterloo & City line. The Victoria line is operated using automatic train operation, but all trains still carry drivers. It has 16 stations. The Waterloo & City line, colloquially known as The Drain, is a London Underground shuttle line that runs between Waterloo and Bank with no intermediate stops. Its primary traffic consists of commuters from south-west London, Surrey and Hampshire arriving at Waterloo main line station and travelling forward to the City of London financial district, and for this reason the line is normally closed on Sundays. Coloured turquoise on the Tube map, it is by far the shortest line on the Underground network, being 2.37 km (1.47 miles) long, with an end-to-end journey lasting just four minutes.