Scrap Iron Haven 4: Context Ash.. Scrap Iron Haven, #4

Mark Taper is no stranger to the strange, but when a supposedly legendary locomotive (the Ash Sky Rail) appears in records he's never seen before, the city's most brilliant investigator smells a trap. Despite his encyclopedic knowledge of S. I. Haven, this "miraculous" train is a ghost in the machine, and inconsistent stories from those around him suggest a conspiracy of mass misinformation. When Mark, Glim, and the world-famous rock star 27 Cheshire are suddenly "teleported" from a quiet bar onto the moving train, they find themselves trapped in a luxury banquet celebrating the Mayor's birthday...an event that, by all electronic accounts, shouldn't be happening for another week.
As they navigate the shifting, improbable reality of the "Train World", they are hunted by the brutal Chief Rush Skylar and a host of bizarre, fictionalized adversaries born from the train's own narrative. To stop the locomotive before its volatile engines reach a breaking point, Mark must team up with an unlikely ally... the world's most proficient serial killer, Doremi.