You have more room, mostly. A Prevost bus conversion is 45 feet long while a railcar is 80-ish feet long (less a few feet for the vestibule and/or rear platform). The rail car is wider, except when you park your bus and put the slide-outs out.
Of course, travel options are significantly broader with an RV since paved roads go everywhere. However you can't take an RV into some cities in the northeast - I know that Washington DC and Baltimore have banned them from their streets. Whereas Amtrak takes you right into the city center.
Of course, travel options are significantly broader with an RV since paved roads go everywhere. However you can't take an RV into some cities in the northeast - I know that Washington DC and Baltimore have banned them from their streets. Whereas Amtrak takes you right into the city center.