Greenford station is above ground level with an island platform for the Central line. A bay platform facing south-east between the Underground platforms serves the Greenford branch service operated by Great Western Railway. The branch line then continues south and joins the Great Western Main Line at. Platform 1 is for westbound Central line trains, and platform 3 for eastbound trains. The access to the platform via escalators takes passengers to the front of the train for westbound service, and the rear for eastbound service. Greenford was the first London Underground station to have an escalator up to platforms above street level. Until 2014 it remained the final London Underground station with a wooden-treaded escalator in service; all other such escalators were previously converted to fully metal treads, or removed altogether from sub-surface Underground stations in the wake of the fatal 1987 King's Cross fire. The line between Greenford and West Ealing carries infrequent freight services from Paddington New Yard and sand traffic for Park Royal and is occasionally used by passenger services. In 2009, because of financial constraints, TfL decided to stop work on a project to provide step-free access at Greenford and five other stations, on the grounds that these were relatively quiet stations and some were already one or two stops away from an existing step-free station. £3.9 million was spent on Greenford before the project was halted. The step-free access project, consisting of an innovative glass incline lift, was later restarted, and the incline lift opened on 20 October 2015.
Signalling
One of the few remaining semaphore signalling installations in London is on the adjacent New North Main Line which Greenford East signal box controls along with the Greenford branch as far as South Greenford. Great Western type lower quadrant signals are still in use. British Rail plans from the early 1990s to do away with Greenford East signal box and its semaphore signals, with upgraded signalling controlled by Slough and Marylebone signalling centres, were postponed indefinitely as the decline of rail traffic controlled by Greenford East did not justify the cost.
Services
London Underground
The typical off-peak service in trains per hour is:
9 tph westbound to West Ruislip
3 tph westbound to Northolt
9 tph eastbound to Epping
3 tph eastbound to Loughton
National Rail
Great Western Railway operate a shuttle service to West Ealing every 30 minutes between Mondays and Saturdays. There is no Sunday service on the line. Services call at South Greenford, Castle Bar Park, Drayton Green and West Ealing and the journey time is just over 10 minutes. The final service of the day runs through to London Paddington, as well as the first terminating service. Until January 2017, all services used to run to and from London Paddington however it was then reduced to just a shuttle to and from West Ealing after the new bay platform was built there to allow for Elizabeth Line services to Reading.