(actually I think it is something a billionaire does in a NS book)

They travel by train in Termination Shock, a book by NS :)

It's definitely something a zillionaire does in a Peter F. Hamilton book, except instead of a rail car it's a zepplin. I mean, if I were a zillionaire I guess I'd live in a zepplin too.

I think everyone pretty much has to admit that “robber baron with zeppelin” is the peak billionaire style.