I have a copy of the 1950 Pullman Company descriptive list of cars. If it was built or on order before the cutoff, I'll at least have plan and diagram number.You maight want to check out David Randall's ongoing series of Pullman/Pullman Standard plans books ... assuming this car is a Pullman product. Then again, he is doing a series on Budd cars, so maybe someday he'll do ACF.
John
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The City of Saint Louis (UP, 1967) is still my standard for passenger operations