Not sure why the Bobs are hijacking this; they must be pressing GGD for more SAL cars
Back on topic, the SAL ran the Silver Meteor between Miami and Richmond, where the RF&P took it to DC, where the PRR picked it up with GG1s and continued on to New York/Boston. The American-Rails.com web site said the sleepers continued with the PRR, so I'm not sure about the GGD coach. (Note Bob's pictures above: the Bradenton was a sleeper and the Chester looks like the same car.) From the web site for the southbound train:
"Listed as Trains #57 on Seaboard's timetable, the Silver Meteor would depart Pennsylvania Station at 2:55 pm, powered by PRR GG1s until reaching Washington, D.C. where the train was handed off, about four hours later, to the Richmond, Fredericksburg & Potomac. The RF&P carried the train another few hours until reaching Richmond's Main Street Station before 10 pm. From this point the Seaboard carried its train the rest of the way to Florida, arriving in Miami by nearly 5 pm the next day (the train also provided connecting service to Tampa, Venice, and St. Petersburg)."
The Silver Star was later added to the same Silver Meteor route to handle increased traffic, and the Silver Comet ran the same PRR route but did not go to Miami. It sounds like for the time frame of the agreement between the PRR, RF&P, and SAL the Silver Meteor/Comet/Star cars of the PRR ran in blocks between DC and Boston, probably with the Congressionals. They could also have been on other PRR trains with Tuscan painted cars. The article did not say.
I would say it would be okay run these PRR cars with any other scale length PRR passenger cars. Need a GG1 up front.