Well, it's an adventure story, and a Bildungsroman, of course, but there was also the intention to describe a culture that had been seen in rather narrow terms.
“For every album, I look at where I'm at in my career and think of a title that kind of represents that. And for me, 'Night Train' was kind of a metaphor for where things have gone, from being on one bus with 12 other guys, pulling a trailer my first few years on the road, to now. We're out here with”