It’s looking very much as though I’m going to have to add a category just for the London Underground map. After this animation yesterday, here’s some serious tube map action, mostly via Interconnected. Don’t eat it all at once.
First, here’s the non-topographical tube map.
Edward Tufte on the tube map.
Finally, for the real cartophile, or novelist requiring London source material, images of tube maps going back to 1908.