Maybe it's the annoyance that keeps him from outright shooting the other man down or perhaps it's the sheer boredom. Either way for once he doesn't see a reason to not indulge in the discussion with someone else.

"Trains, no. It would be cumbersome to attempt to use. Travel through the void is far simpler when one needs only focus on moving ones soul." Should he expand on the statement? Probably but he doesn't feel the need to.