"I'm not familiar with any Earths, you, BD?" The beeping in response to that was a clear negative. "Where about was the one you're from?"

"So the chassis is from this other train? I guess that's why I haven't seen the model before." Did Cal just miss part of that explanation? Yes. Give him time. He'll probably catch it eventually. Probably.

BD was distracted too, hopping down to go check out the trees and other plants around the station.