From the back of the adventure:
"Ask Not For Whom The Whistle Blows...
...because it just might be blowing for you!
At least that's what it seems like to Ronan Lynch when he heard the Night Train blowing its terrifying tune in the dark Kansas night. He'd been trying to get the Hell out of Dodge when he was bushwacked, and that long, low scream was the first thing he heard after coming back from the dead-again. Try as he might, this one-handed gun-slinger can't seem to escape his destiny to meet with the Night Train and it's blood-soaked freight."