The easternmost part of the GWR line forming a circuit from Old Oak Common through Park Royal and then curving to West Ealing, was opened on 15 June 1903, enabling a passenger service to Park Royal for the Royal Agricultural Show there. The line was closed again west of Park Royal from 10 August because of concerns about the stability of embankments after exceptionally heavy rainfall. The line opened again on 1 May 1904, and in October 1904 the short extension from Greenford East Junction to Greenford station was opened.