new housing development. The station was designed by the LPTB's architectural department in conjunction with the estates department of All Souls College. The station platforms were to be on the viaduct and on a bridge over Spur Road and were to be long enough for nine-car trains being planned for the new Northern line service. The ticket hall was to be located under the bridge with stairs up to the platforms and provision for escalators to be installed later. The station was to be provided with a car park for 20–25 cars. Construction on the Northern Heights project began in the late 1930s but was interrupted by the Second World War. Most of the work to that date had been carried out on LNER branch tracks, but work between Edgware and Bushey Heath had started in June 1939. The route of the line had been cleared and laid out and some earthworks and tunnelling carried out between Edgware and Elstree South. At the site of Brockley Hill station and south of Edgware Way, construction of the piers of the viaduct had begun and three out of 12 arches at Brockley Hill station had been completed by August 1939. Following the outbreak of war in Europe, work on the station and the extension was suspended in September 1939 and was formally terminated in December of the same year as wartime funding restrictions would prevent completion. During the war years, the LPTB-owned land was used for farming vegetables for staff canteens. Cancellation The sites of the new stations were semi-rural and, as elsewhere, it was intended that the new section would stimulate the construction of housing estates that the stations would serve. After the war, new legislation limited expansion of urban areas into the countryside. This created the Metropolitan Green Belt around London and the area covered the Northern line extension. Without housing estates, the line had no purpose and the plans for the route north of Brockley Hill were cancelled in October 1950. Some consideration was given to completing the extension as far as Brockley Hill, as it had some housing and the site lay just within the green belt. The line beyond to Bushey Heath would have been completed for access to the depot. Analysis showed the capacity needed without the Bushey extension could be accommodated by developing LNER's former Highgate depot, and the final part of the route was