History of public transport authorities in London
The history of public transport authorities in London details the various organisations that have been responsible for the public transport network in and around London, England - including buses, coaches, trams, trolleybuses, Docklands Light Railway, and the London Underground. From 1933 until 2000, these bodies used the London Transport brand.
Source: Wikipedia — History of public transport authorities in London (CC BY-SA 4.0)