Nah, thats just a reimagining of the Tube map. When I say the Circle line, I'm talking about the line on the map named Circle.
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EDIT: Tonight I'll be posting the version of the map which I posted in the IC. Chances are I'll be using MS Paint to draw faction borders and possibly add other details as well. I could do the same with the geographically correct map of the tunnels too.
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EDIT: I've posted the regular style map in the OP. Since the other is in a pdf I'll need to wait until I'm home, so I can screenshot it.