First underground railway system
Who
London Underground
What
first
Where
United Kingdom (London)
When

The London Underground, London, UK, is the first and oldest metro system in the world, with its first section opening on 9 January 1863 and the first passenger journeys on the following day. The initial stretch of the then Metropolitan Railway ran 6 km (3.73 miles) between Paddington and Farringdon Street. To build the line, the "cut and cover" system was used, with streets along the route dug up, tracks laid in a trench, and then re-covered with a brick tunnel and new upper road surface.