Daniel sez, "I made an Undertaking (subway) map for Ankh-Morpork [ed: Terry Pratchett's imaginary city, from the Discworld books], set about 50 years in the future (from canon 'now'). I took some liberties with names of places, given the time gap. For instance, Dolly Sisters has become Dollisters, the Whore Pits has become Harpits. Locations are based on the canonical Ankh-Morpork map. Note that the logo is actually octarine — your monitor may not calibrated to display that color properly."
The concluding sequence from Making Money implies that the next project for Moist von Lipwig will be this subway — that's a book I'm anxious to read.