He guesses Nita means she hasn't actually had any telepathic conversations with the train, just collected impressions.

"If Kit is your boyfriend as well as your partner, then I'm sorry you two were separated when the train snatched you away from your world. I hope that you two may be reunited, somehow. And I can see why you thought Kit might be able to give a better answer as to the train's identity. If he understands machines and rocks, he'd probably know what the train is."

He grins at Nita. "You're welcome, and thank you, too. We make rather a good team, both in conversation and in action."