The Emperor’s Railroad by Guy Haley
Tradepaperback – Tor.com – Apr2016
A Tale of the Dreaming Cities.
Global war devastated the environment, a zombie-like plague wiped out much of humanity, and civilization as we once understood it came to a standstill. But that was a thousand years ago, and the world is now a very different place.
Conflict between city states is constant, superstition is rife, and machine relics, mutant creatures and resurrected prehistoric beasts trouble the land. Watching over all are the silent Dreaming Cities. Homes of the angels, bastion outposts of heaven on Earth. Or so the church claims. Very few go in, and nobody ever comes out.