[n 4] Works began in the late 1930s and were at an advanced stage when they were interrupted and halted by the Second World War.

The section of line between Finchley Central station and Edgware was closed to passenger services on 11 September 1939.

[1][n 5] After the war a shortage of funds and the introduction of the Metropolitan Green Belt led to the cancellation of the unfinished Northern line elements of the "New Works Programme" in 1950.

[5][n 6] The goods yard at Edgware continued to operate with British Rail trains running from Finsbury Park until 1 June 1964 when it was completely closed.

The site of Edgware railway station is now occupied by a shopping centre called The Broadwalk Centre, alongside part of whose car park runs a small stretch of the former trackbed, leading to the still-standing bridge over the Northern line tracks into the Underground station.