Seaboard's comment rang a bell, as I remember seeing it when I was in college. I rooted through my pile of slides and found this. Surprisingly it was taken later, March 1970. Lots going on this photo. Broad street station in Richmond is now a museum, a classic railroad office car is in the backround, and the dome is one of the three the B&O used on the Capitol Limited. Perhaps it's Moonlight Dome that until recently was in PV service and I believe was bought by the NS for their Office Car Special trains. I wouldn't be surprised if the new head of operations, Cindy Sanborn, didn't have something to do with this as I suspect she is a closet raiilfan given here railroad pedigree.I believe the ACL also put some leased dome cars on the Florida Special in later years. I've seen photos of a dome with a SCL herald in Richmond
The SCL certainly ran a first class passenger operation until the end. Compare this with the sorry trains on the PC. According to the SCL timetable the Florida Special by this time was also carrying coaches but it still had 7 sleepers, 2 diners, and a recreation car. The dome was unique in that it had 5 roomettes, 3 compartments and a single room - I assume a bedroom. Also operating to Florida then were the Silver Meteor, Silver Star, Champion, Gulf Coast Special, and Everglades. The Palmland had been cut back to Columbia.