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Constructed by Sir Marc Brunel and his son Isambard, the Thames Tunnel opens
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On 10 January, The Metropolitan Railway opens the world's first underground railway, between Paddington (then called Bishop's Road) and Farringdon Street
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The first section of the Metropolitan District Railway, from South Kensington to Westminster (now part of the District and Circle lines), opens
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The first steam trains travel through the Brunels' Thames Tunnel
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Running from the Tower of London to Bermondsey, the first Tube tunnel opens
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The Circle line is completed
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On 18 December, The City and South London Railway opens the world's first deep-level electric railway. It runs from King William Street in the City of London, under the River Thames, to Stockwell
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The Prince of Wales opens the Central London Railway from Shepherd's Bush to Bank (the 'Twopenny Tube'). This is now part of the Central line
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The Underground Electric Railway Company of London (known as the Underground Group) is formed. By the start of WWI, mergers had brought all lines - except the Metropolitan line
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District and Circle lines become electrified
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Baker Street & Waterloo Railway (now part of the Bakerloo line) opens and runs from Baker Street to Kennington Road (now Lambeth North). Great Northern, Piccadilly & Brompton Railway (now part of the Piccadilly line) opens between Hammersmith and Finsbury Park
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Between September 1940 and May 1945, most Tube station platforms are used as air raid shelters. Some, like the Piccadilly line, Holborn - Aldwych branch, are closed to store British Museum treasures
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The Queen opens the Victoria line
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The Prince of Wales opens the Jubilee line
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A tragic fire at King's Cross station kills 31 people
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The Oyster card is introduced
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52 people are killed in bomb attacks on three Tube trains and a bus on 7 July
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All-night Night Tube services begin operating on sections of some lines on Fridays and Saturdays.