Here’s a fantastic historical document – a tube map used by engineers in London to mark out the status of services on the Underground during World War II. By the look of it, this map was updated at least daily, if not even more often, as this date falls squarely within the Blitz – a period where London was bombed for 57 consecutive nights by the Luftwaffe.

The map itself looks like a modified hand-drawn version of H.C. Beck’s 1936 Tube Diagram, with all stations shown as circles and some main line track added as well. The use of the map is simple: a red line along track shows that there is no service along that segment, while a blue circle (seen between Belsize Park and Chalk Farm, for example) indicates the location of an exploded bomb. It would also seem that the circle for a station is also coloured red if it is substantially damaged or destroyed. Most horrifying of all, a red cross marks the location of an unexploded bomb. Notes written in a beautiful, precise hand add detail to these symbols where necessary – “unsafe buildings”, “single tunnel only available for traffic: SB tunnel damaged by bomb”.

Our rating: An incredible historical document that vividly recalls the dangers and horrors faced by Londoners during the Blitz. 5 stars!

Source: IanVisits/Flickr