The idea of the map came from Kim Stanley Robinson’s Mars trilogy and it is one of the great science fiction books of our times. http://en.wikipedia.org/wiki/Mars_trilogy Since NASA is planning for new Mars exploration it is still a very timely subject. There are a lot of new industries. Solar energy, bio-fuels. No oil or coal or polluting industries. We have Mini-Black holes, bottled Sunshine to name a few. Transportation is all electric. The ground tolerance was adjusted, so there is no use for for the tunnels (they are expensive), there are no wood or trussed metal bridges.