Will we have ground transportation between cities, like railroads?

Yes and no. We don't have tools yet to do that. If you think about Lorville, it has tracks that you follow, and we don't have any tools to do that except by doing it by hand, which, as we already said in this chat, on this scale it's impossible to do everything by hand. So as we're looking at it right now, we don't have plans to add that to our existing locations, but we don't know what the tools could do in the future. So, definitely maybe.

It would be fun to do the Firefly railway heist kind of thing across the countryside of Lorville.