By Amtrak’s day rail travel in the US was well on the decline, but there were thousands of Pullman cars in operation in the early 20th century.
These are called couchettes on European trains. I won’t take one if I’m travelling alone, but they’re great if your family can take all 4 bunks, or 3 bunks but buy 4 tickets…This only works if the couchette cars aren’t segregated by sex.
With those pods you can draw your curtain and have a bit of privacy.
Just like the “open-section accommodations” Pullman introduced in the 19th century.
