On 4 October 1975 the line was closed and ceased to be part of the London Underground. The line was transferred to British Rail (BR) and the unused ramps from the cancelled Northern Heights plan finally received the tracks to connect the line to the surface platforms at Finsbury Park. On 8 August 1976 Drayton Park reopened as part of the BR network, with main-line-sized trains running to Old Street. On 8 November 1976, the line was opened for main-line trains from Moorgate to Finsbury Park and beyond, 72 years after the GN&CR opened, as had been originally intended.