Atlantic Coast Line/Seaboard winter fleet in the summer

Until 1955, the summer-only East Wind between New York and Portland ME carried a dining car leased from the Atlantic Coast Line's idled wintertime fleet.
Can anyone provide more details of this arrangement? Could it have been one of the Florida Special cars?

Were other cars from ACL's fleet leased to summer-only trains to northern destinations?

Did Seaboard do something similar, or was this limited to the ACL?

My specific reason for asking is the discussion in the Bar Harbor Express - East Wind (B&M/MEC Seasonal Service) thread, but any information would be greatly appreciated.

eastwind

I've come across this two-page thread in the NHRHTA New Haven Railroad Forum, which, part way down on the first page, gives details of the consist of the summer-only (PRR-)NH-B&M(-MeC) East Wind for both pre- and post-war periods.

In particular, it mentions the following Atlantic Coast Line cars:

• Atlantic Coast Line (leased) tavern-lounge car #5403, “South Carolina”
• Atlantic Coast Line (leased) diner “Bangor”
• Atlantic Coast Line (leased) tavern-lounge car #5204, “North Carolina”
• Atlantic Coast Line (leased) diner “Portland”
• Atlantic Coast Line (leased) diner “Sumpter”

Can anyone verify that these were indeed Atlantic Coast Line cars, or were the names made up by the modeler, Division Point?