It's the principle of travel between parallel universes where I'm from. Only one person's capable of it, so a train like this is something beyond logical comprehension by the logic of my world. But since it's so easily achieved here, time travel is no less insane.

[He started tapping his left foot in an overabundance of nervous energy, frowning.]

At that point, it sounds like we're bordering on considering how to hack the train and altering its parameters. And if there isn't any other way to break out of whatever infinite loop it's stuck in, we may have to.