Piccadilly line
In the early 1930s, the London Electric Railway, precursor of the London Underground and owner of the District and Piccadilly lines, began the reconstruction of the tracks between and to enable the Piccadilly line to be extended from Hammersmith to and (then the terminus of what is now the Heathrow branch). Express non-stop tracks were provided for the Piccadilly line between the stopping lines of the District line. Services on the Piccadilly line began running through Turnham Green on 4 July 1932.