The route for the railway north from Edgware station had been reserved through the W&ER's right of way before Edgware station was built.
As Edgware developed as a suburb of London following the opening of the Underground station in 1924, the route was left clear of housing.

The line was to pass under Station Road and Rectory Lane.
It would have then run in a cutting north-west, before cutting Purcells Avenue in two, where a footbridge was to be provided to connect the severed ends.
North of Purcells Avenue the tracks continued north-west, rising on to a viaduct to cross over Edgware Way on a bridge to meet the viaduct at the southern end of Brockley Hill station.
Following the abandonment of the extension, the unused land between Edgware and Brockley Hill was developed for housing with the western end of Heronsgate, Campbell Croft, Shelley Close and the southern section of Sterling Avenue filling the space.
The route for the railway north from Edgware station had been reserved through the W&ER's right of way before Edgware station was built. As Edgware developed as a suburb of London following the opening of the Underground station in 1924, the route was left clear of housing.
The line was to pass under Station Road and Rectory Lane. It would have then run in a cutting north-west, before cutting Purcells Avenue in two, where a footbridge was to be provided to connect the severed ends. North of Purcells Avenue the tracks continued north-west, rising on to a viaduct to cross over Edgware Way on a bridge to meet the viaduct at the southern end of Brockley Hill station. Following the abandonment of the extension, the unused land between Edgware and Brockley Hill was developed for housing with the western end of Heronsgate, Campbell Croft, Shelley Close and the southern section of Sterling Avenue filling the space.
Brockley Hill tube station