Second picture from the top-any idea what the white roofed car is at the 7 o' clock position? It looks like it has wrap around windows but on a single level?
I'm not sure, but I think its an old Seaboard Coast Line car, originally built for the Seaboard Air Line in 1955. Amtrak acquired 3 of them sometime between 1972 and 1976. They were SCL numbers 6500-6502, Amtrak numbers 3230-3232, and were named Sunbeam, Sun Ray, and Sun View. They are 5-db bar-lounge cars. I don't think they made it past the Heritage conversions- its unlikely, not many sleepers made it through that weren't 10-6s, 24-8s, or 16-10s. (Perhaps the ex B&O 16-4s made it, too) A few 11-DB were on the roster, but I think they were only used in captive Auto Train service.
If that is what it is, that represented some good railroading. Those cars, called Sun Rooms, were on the pre-Amtrak Silver Meteor from NYC to Miami. 1955 was rather a late year for railroads to still be bothering with ordering new equipment. So many lines were already starting to give up by then, but not Seaboard. Of course there were the usual restrictions on domes in NYP. But it was marketed as kind of a sun room, patio effect,something apparently becoming very popular in Florida at that time.
Similarly some new coaches were ordered at that time also, for both the pre-Amtrak Silver Meteor and the Silver Star. These cars had a mid-car smoking lounge. It did not mean full service lounge as in today's lingo,but just a sitting space, like a lobby. Of course the whole thing against not smoking had not even begun then. However,I think even then,in those coaches you were ony allowed to smoke in that lounge and not back at your seats--not sure. One of the advertised benefits of that arrangment is that it broke off the sometimes-cited "tunnel effect" of a coach.