North Acton to West Ruislip was built by GWR on behalf of the Underground in 1947–8 alongside the pre-existing tracks from Old Oak Common junction towards High Wycombe and beyond, which date from 1904.
North Acton til West Ruislip blev anlagt af GWR på vegne af The Underground i 1947–48 langs de allerede eksisterende spor fra Old Oak Common Junction mod High Wycombe og videre, hvilke dateres til 1904.