The formation was made wide enough at Ruislip to enable another pair of tracks to be constructed as passing loops or additional platform roads.

On 1 March 1910, an extension of the District line from South Harrow to connect with the Metropolitan Railway at Rayners Lane was opened enabling District line trains to serve stations between Rayners Lane and Uxbridge from that date.

Trains must detrain in the westbound platform and then continue for approximately half a mile to a reversing siding leading to Ruislip Depot.

After reversing, the train must come back the way it came and enter the eastbound platform by means of a crossover.

There was formerly a crossover to the east of the station enabling trains to leave the westbound platform in an easterly direction, and a goods yard to the north of the line.