The Edgware extension utilised unused plans dating back to 1901 for the Edgware and Hampstead Railway (E&HR) which the UERL had taken over in 1912. It extended the CCE&HR line from its terminus at Golders Green to Edgware in two stages – to Hendon Central in 1923 and to Edgware in 1924. The line crossed undeveloped open countryside and, apart from a short tunnel north of Hendon Central, was on the surface.