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The London Underground is a public rapid transit system serving Greater London and some parts of the adjacent counties of Buckinghamshire, Essex and Hertfordshire in the United Kingdom.

London Underground
London Underground logo, known as the roundel, is made of a red circle with a horizontal blue bar.
A deep level train stops to the right of a platform as some people (left) wait to board it.
A deep-level Central line train at Lancaster Gate bound for Ealing Broadway
A train is slowing to stop at a platform on the right. Although there is a roof, sunlight can be seen through gaps; another platform and track can be seen on left. People are standing or walking on both platforms.
A larger sub-surface Metropolitan line train at Farringdon bound for Aldgate
Locale Greater London, Buckinghamshire, Essex, Hertfordshire
Transit type Rapid transit
Number of lines 11
Number of stations 270 served (260 owned)
Daily ridership 4.8 million
Annual ridership 1.34 billion (2015/16)
Website London Underground
Began operation 10 January 1863; 153 years ago (1863-01-10)
Operator(s) London Underground Limited
Reporting marks LT (National Rail)
System length 402 km (250 mi)
Track gauge 1,435 mm (4 ft 8 2 in) standard gauge
Electrification 630 V DC fourth rail
Average speed 33 km/h (21 mph)

The London Underground (also known simply as the Underground, or by its nickname the Tube) is a public rapid transit system serving Greater London and some parts of the adjacent counties of Buckinghamshire, Essex and Hertfordshire in the United Kingdom.

The world's first underground railway, the Metropolitan Railway, which opened in 1863, is now part of the Circle, Hammersmith & City and Metropolitan lines; the first line to operate underground electric traction trains, the City & South London Railway in 1890, is now part of the Northern line. The network has expanded to 11 lines, and in 2015–16 carried 1.34 billion passengers, making it the world's 11th busiest metro system. The 11 lines collectively handle approximately 4.8 million passengers a day.

The system's first tunnels were built just below the surface, using the cut-and-cover method; later, smaller, roughly circular tunnels – which gave rise to its nickname, the Tube – were dug through at a deeper level. The system has 270 stations and 250 miles (400 km) of track. Despite its name, only 45% of the system is actually underground in tunnels, with much of the network in the outer environs of London being on the surface. In addition, the Underground does not cover most southern parts of Greater London, with less than 10% of the stations located south of the River Thames.

The early tube lines, originally owned by several private companies, were brought together under the "UndergrounD" brand in the early 20th century and eventually merged along with the sub-surface lines and bus services in 1933 to form London Transport under the control of the London Passenger Transport Board (LPTB). The current operator, London Underground Limited (LUL), is a wholly owned subsidiary of Transport for London (TfL), the statutory corporation responsible for the transport network in Greater London. As of 2015, 92% of operational expenditure is covered by passenger fares. The Travelcard ticket was introduced in 1983 and Oyster, a contactless ticketing system, in 2003. Contactless card payments were introduced in 2014.

The LPTB was a prominent patron of art and design, commissioning many new station buildings, posters and public artworks in a modernist style. The schematic Tube map, designed by Harry Beck in 1931, was voted a national design icon in 2006 and now includes other TfL transport systems such as the Docklands Light Railway, London Overground and TfL Rail. Other famous London Underground branding includes the roundel and Johnston typeface, created by Edward Johnston in 1916.

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