All months, over the course of 10 years. If you mean, when was the Underground officially opened, the answer is January 1863.
The underground railroad was built over a series of years, not a specific month.
London Underground was created in 1863.
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1883 The London Underground system that now forms the Metropolitan line from Farringdon to Baker Street was opened to the public on 10th January 1863.
The London Underground is the largest in Europe and the oldest in the world.
The London Tube, the first underground railway system in the world, was built in the mid-19th century. The first line, the Metropolitan Railway, opened in 1863.
In London Underground (tube) stations.
The London Underground did give the East London line to the London Overground to ease its traffic.
The London Underground. Travel For London (TFL) is responsible for the London Underground and the other transport networks in London.
The only railway under the river Thames is parts of the London Underground (tube).
London Underground is known by Londoners as 'the tube'.
The track difference of the track layout of the London Underground and London Overground is whereas one is underground the other is over the ground.