At those prices, this would have to compete against options like a private chauffeur in a Rolls-Royce though, or a private luxury tour bus. Both of which would come in considerably cheaper.
I would rather fly commercial than be driven in any private vehicle long distance. I would, however, embrace the luxury of a slower trip by private railcar. Beyond the novelty, I could presumably stretch out and sleep and maybe enjoy a great meal.
I think the historical element has a strong appeal. Say, a restored luxury railcar with period appropriate antiques. That would be an experience that is hard to get elsewhere. Even old style hotels and such somehow feel less authentic and "alive" than riding in a luxury railcar from the 1800s.
It depends. I take the Amtrack from Albany to Chicago once a year or so because I hate flying. It's maybe an hour or two slower than driving and that's with a lot of time built in to the schedule for delays. The last time I took it We left Albany 45 minutes late and still made it on time to Chicago. Yes, delays happen, just like in traffic or at the air port, but I find the focus on delays when Amtrak comes up extremely over-stated. Perhaps it's just the routes I'm on.
Private rail car is nowhere near as comfortable as actually getting home quickly, especially you have the kind of home that people with all the money in the world do.
Many people with money travel so much home is a hotel. They 'have a large manson that the staff says is nice' isn't quite the truth but it isn't far off.
though they also don't have time to take a slow train.
Perhaps more of a European mega-rich habit, not especially applicable to the US, is the practice of just taking the mansion, helicopters, and cars with you on a super yacht.
I'd forbid those things in territorial waters. They bring no money to local communities and are glad to do things like ignore nature reserves or go with motor boats where people are swimming, which is of course illegal but they don't care.
For example, Portland to Seattle isn't that far but I-5 can easily back up and become an hours-long ordeal, and SEA and PDX aren't particularly close to a lot of places.
Agreed that SEA to PDX is uniquely useful on the west coast. Similar trips are also practical in the north east for the same reasons (relatively short distance for a flight, high car traffic and great station locations)
While this is true, there is also something to be said about predictability.
A train that is an hour slower than the best driving time but consistently so is easier to plan around than a car that is an hour faster or an hour slower than the train with no clear rhyme or reason.