Toast takes a look at "The Last Call - Books 1 & 2," by Vasilis Lolos, and published by Oni Press.
Book 1 -
"While out on a midnight drive, two friends - Alec and Sam - are hit by the "Ghost Train," an inter-dimensional soul carrier. They wake up to discover themselves stuck on the train with no way off. As they search for an escape, they uncover clues that lead them deeper, and into the path of a killer!"
Book 2 -
"After being separated in Book 1, the pair find one another, but it's not the reunion they expected. Alec has aged ten years while for Sam, it has only been ten hours. There's no time to catchup, though. Someone is still murdering the passengers, and some how, it's connected to the boy's appearance on the train."