I was just googling around, and it looks to me like a private rail car costs something like a 2nd home, storage fees similar to property tax, $4/mile to have Amtrak haul you around. Basically a vacation home, but mobile. Definitely a 1% thing, but not billionaires-only. Probably way more prestige in saying you've got a private rail car than a beach house. At least among a certain segment.

Most interesting thing I've learned all week.