She's got a pretty good feeling Curtis would agree with Nate's assessment of trains and she hesitates before continuing, but only for a moment. Explaining to Nate about the train isn't giving away any sort of personal information Curtis has trusted her with. There are things he's done on the train, things she knows he feels guilty about and she won't share those with anyone. He had said those things to her with the expectation of confidence and Beth isn't the sort to betray something like that.

"His world sorta ended, too," she explains. "He was... a teenager, I think, when it happened. The whole world froze, went into an ice age, but there was this guy who'd built a train that could be run continuously on a track that connected the whole world and I guess a bunch of people boarded it before it got too cold to survive and they were just livin' on the train as it ran on the track over and over and over again."

She frowns a little and says, "It wasn't a good place to live. I know he was tryin' to change things."