Some photos attached from the PRR Technical and Historical volume covering Passenger car paint schemes. . Yhe book mentions in the late 1940s some 46 cars built for New York to Atlanta and New Orleans service were built to plan 4140. These were 10-6 sleepers . Southern had 29, PRR 8, L&N 2 FEC 5 cars , Atlanta and West poinrt 1 and Western of Alabama 1 car.
The 8 PRR cars were assigned names in the River series. PRR's normal naming for 10-6 cars were in the Rapids series. . The photo below shows Raritan River from about 1968. It has a black roof . I recall as a college student in the early 1960s seeing Southern cars at Sunnyside from the Number 7 elevated as it passed over Sunnyside and the Southern cars did have Black roofs. I believe equipment used in the 1970s version of Southern Crescent had black roofs.
Here is the painting guide illustration from the book for the 10-6s
and a list of PRR 10-6s in the River Series
I had bought the Lionel cars released a few years back. They have black roofs. The Lionel E-8 set is probably colored for 1970s service after Amtrak was formed. So a PRR lettered car in the consist would be a bit of fantasy from a time aspect
Another interesting thought for through cars on this train was the last of the transcontinental sleepers, the service started in 1968 with a through sleeper operating from San Francisco through LA to New Orleans on the Southern Pacific and then being carried by the Crescent from New Orleans to New York and later Boston . I believe this service lasted into the Amtrak era so it would be interesting to know if there were Amtrak 10-6s in the 1970s consists or would the car have always been a Southern badged car.