As a child, I traveled in upper and lower berths with my parents in the early 1950s. The cars I remember the most were L&N's 6 sections, 6 roomette, 4 double bedroom cars which were streamlined and built for the Georgian and Hummingbird. These cars ran almost til Amtrak. It was fun to book a seat in a section for day travel.
DId somebody say L&N? Time for me to salivate!!!
I never officially rode in a section..
But one night shorty before Xmas 1964 I rode the old Dixie Flyer from Chattanooga to Chicago. They had apparently run out of spare coaches so they put a section sleeper in to ride as a coach Mind you there was no porter, no pillow,no sheets --------------nothing. It was purely supposed to be coach
Fortunately there were some military guys on board who knew a lot more about train travel than I did at that tender age.. They knew how to make down the beds--- at least the lower. They were thoughful enough to come over and work the bed for me.
I slept with my clothes on except for my shoes and I used my coat as a pillow. I did realize the bed was wide and comfy. but otherwise I had no sleeping car accommodation to compare it with.at that age.