The pilot motor cars were used in pairs, one at each end of the train being transferred, and carried large stencils to indicate that they were not for scrapping. When these duties were completed, most of the pilot motor cars were also scrapped, but one motor car and an associated trailer car were moved from Ruislip depot to for preservation at the Buckinghamshire Railway Centre. In recent years, the number of trains stored at the depot in order to provide the timetabled levels of service has increased. In 1978, there were normally 24 trains, although this was increased to 26, when the Earl's Court to Kensington (Olympia) exhibition service was required. By 1993, this number had increased to 29, and had increased again to 31 by 2002. The depot is accessed by road through a gate at the end of Granville Gardens, which joins the main A4020 Uxbridge Road just to the east of Ealing Common station. Access to the London Transport Museum Depot and its associated yard, which is located at the south-eastern corner of the main depot, is provided by a service road called Museum Way, which turns off the A4000 Gunnersbury Lane opposite Acton Town station. The museum building and yard are linked to the main depot by rail, but access is through a locked gate, for both rail vehicles and people.