1946 "UNDERGROUND DIAGRAM OF LINES No 1 1946". A fine example of the early London Underground map, the first one published after the end of WWII, designed by Harry Beck. Condition generally very good with expected light wear and tear.

This version of the Underground map designed by H C Beck uses two types of dotted line to show lines under construction and lines to be electrified, as shown for the Central and Northern line extensions. There is a notice that the Central Line extension from Liverpool Street to Stratford was due to open January 1947. Station names are no longer duplicated where there are two lines being served and all names are printed in black instead of the line colour. Mark Lane has been renamed Tower Hill. The escalator connection between Bank and Monument is not indicated on this map and the River Thames is shown as a solid blue feature instead of dotted. On the reverse of the map the main line termini diagram is printed in dark blue with red labels and the front cover has a red and dark blue Underground roundel and a blue and red decorative border. The map once again shows as under construction the "New Works Plan" (Northern Heights project) to take over the ex-GNR line between Finsbury Park and Edgware and High Barnet, including the Alexandra Palace branch. These were to be incorporated into the Northern Line with a new connection with the Northern City line at Finsbury Park, and an extension from Edgware to Bushey Heath. The project was abandoned at the onset of World War 2 and never restarted, though these lines continued to be shown as under construction until 1950.