I can go to Europe for 2 weeks for $2k or so, all-inclusive. Spending that much money just to sit on a train and look out a window sounds like a fortune to me. Maybe for very sedentary people it's an attractive option. Even a cruise ship is a more active experience, since there's a LOT more to do on a cruise ship, and you can probably do that for less than $2k as well if you avoid all the extras.