 The deep-level platforms were constructed to accommodate extra-long nine-car trains, which were planned for services on the Northern line, but never served Highgate, having been withdrawn at the start of the war. With the interchange between LNER and Northern line services available at Highgate from January 1941, LNER trains to East Finchley ended on 2 March 1941, after which they operated between Finsbury Park and Alexandra Palace only. In 1942, LNER services through Highgate were reduced to rush hour only operations. During the war, the deep-level platforms at Highgate were used, as many were, as a shelter from the bombing of London by the Luftwaffe, and, later, V-1 and V-2 missiles.
