The world’s first city underground railway line was opened in 1863 in London. It was called the Metropolitan. The London Underground (also known simply as the Underground or by its nickname the Tube) is a public rapid transit system serving London region, England and some parts of the adjacent counties of Buckinghamshire, Essex and Hertfordshire in the United Kingdom.
The Underground has its origins in the Metropolitan Railway, the world’s first underground passenger railway. Opened in January 1863, it 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 2017/18 carried 1.357 billion passengers, making it the world’s 12th busiest metro system. The 11 lines collectively handle up to 5 million passengers a day.
The system’s first tunnels were built just below the ground, 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 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 London region, and there are only 29 stations south of the River Thames.
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