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Who doesn't love the tube map? Yet as you no doubt already know the Harry Beck style map we use today, severely distorts geography to make it easier to read. This was a vast improved over previous designs (one of which you can still see just outside Temple station) in terms of readability.
However, when you're walking the tube above ground you want something a little more accurate. The map above courtesy of the new Google Maps shows just how far stations like Amersham, Chesham & Epping are from central London. Gives a whole new perceptive to just how massive this whole walking project has been to date, and how much further I still have to go.
While this is by no means the first time the modern Tube Map has been given the geographically accurate treatment, this is the only one I know of that not only includes the Underground but also the DLR, Overground and Tramlink as well.
Found via Reddit.
Edit: As several people have pointed out to me on Twitter there are a few errors in the map. See if you can find them.