Thanks for the video - it is exactly in my modeling era.
The heavyweight single door baggage cars are on the B&O trains. They are "C-15" express cars.
I always saw pictures of those painted blue. There is one that was apparently painted blue and gray that shows up on a different video, but it is too blurred to read the number on that one. SO, it is a B&O historian's legend still waiting to be revealed.
Some of those in this video are apparently painted Pullman Green. That is news to me, so thanks for the learning experience.
