I cannot be certain if this material is Paywalled, but if not, it is an interesting read:
https://www.wsj.com/articles/wealthy-train-buffs-are-traveling-cross-country-in-super-luxe-railcars-hitched-to-amtrak-trains-1521727200
https://www.wsj.com/articles/wealthy-train-buffs-are-traveling-cross-country-in-super-luxe-railcars-hitched-to-amtrak-trains-1521727200