WRITE A SHORT NOTE ON LONDON UNDER CROUND RAILWAY
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The London Underground (also known simply as the Underground, or by its nickname the Tube) is a public rapid transit system serving London and some parts of the adjacent counties of Buckinghamshire, Essex and Hertfordshire in the United Kingdom.[6]
The Underground has its origins in the Metropolitan Railway, the world's first underground railway. Opened in 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.[7] The network has expanded to 11 lines, and in 2016–17 carried 1.379 billion passengers,[3] making it the world's 11th busiest metro system. The 11 lines collectively handle approximately 4.8 million passengers a day.[2]