In June 1935, the LPTB announced the New Works Programme, an ambitious plan to expand the Underground network which included the integration of a complex of existing London and North Eastern Railway (LNER) lines north of Highgate through the Northern Heights.
I juni 1935 fremlagde LPTB New Works-programmet, en ambitiøs plan om forlængelse af Underground-netværket, der indebar integrering af et indviklet net af de eksisterende London and North Eastern Railway (LNER)-baner nord for Highgate, gennem Northern Heights.