West Ruislip station is aligned approximately east-west with the main station buildings on the road overbridge across the lines at the western end of the station. The station has four platforms; two each for London Underground and National Rail services. The London Underground tracks are south of the National Rail ones and operate from an island platform whilst the National Rail platforms are outside of their tracks. The National Rail platforms are also served by a separate station building north of the tracks and adjacent to the car park. In a legacy of the original scheme to continue the extension to Denham, the Central line tracks continue for a short distance beyond the station before ending at buffers. The intended alignment of the unbuilt tracks can be seen from the width of the unused railway land south of the existing tracks.