The Central London Railway (CLR), also known as the Twopenny Tube, was a deep-level, underground "tube" railway that opened in London in 1900. The CLR's tunnels and stations form the central section of the London Underground's Central line.
Oxford Circus station, an example of the Harry Bell Measures design used for the CLR's stations
CLR Gearless Locomotive
The London Underground is a rapid transit system serving Greater London and some parts of the adjacent home counties of Buckinghamshire, Essex and Hertfordshire in England.
The nickname "Tube" comes from the circular tube-like tunnels through which the small profile trains travel. (Deep level Northern line London Underground 1995 Stock train)
A sub-surface Metropolitan line train (S8 Stock) at Farringdon
The Metropolitan Railway opened in 1863 using GWR broad-gauge locomotives.
Passengers wait to board a tube train in 1906.