Lived in the Chicago area and during the 1960's would visit my sister in Wahpeton/Breckenridge. Slept in the dome cars seats of the Empire Builder, arriving at about 1 AM! I loved watching the small towns go by at night while we were speeding across Minn at 60 or 70 MPH.
Had a brother in Denver, many trips on the CZ and DZ (1960's), spent nights up in the Vista Domes. But one year, I had a roomette. Was great, never had A/C or heating issues. Daytime I would sit in a Vista Dome.
In the 1950's, with a group of young kids, we went to Washington DC, shared a roomette with another kid, but don't know what RR or train we were on. Remember running up and down the isles between rooms looking for my other friends.