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 abandoned on 26 November 1953.

The viaduct piers south of Edgware Way were demolished in 1959 to make way for new housing.
The completed arches of the station viaduct were partially demolished in the 1960s leaving stumps of brickwork in a field and part of the north abutment of the bridge adjacent to Edgware Way.
Earthworks north of the station site parallel with the bypass indicate the route towards Elstree South.
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 abandoned on 26 November 1953.
The viaduct piers south of Edgware Way were demolished in 1959 to make way for new housing. The completed arches of the station viaduct were partially demolished in the 1960s leaving stumps of brickwork in a field and part of the north abutment of the bridge adjacent to Edgware Way. Earthworks north of the station site parallel with the bypass indicate the route towards Elstree South.
Brockley Hill tube station