As recently as about 1990, I saw a similar vintage PQ ACF-built, insulated
103 Baltimore at Lamberts Point on the former B&O. At that time it was
painted in an attractive (albeit faded) blue and yellow paint scheme.
Although I don't know for sure, I doubt the car was in free interchange. My
guess then was that it was shuttling between Balto and Phila (or wherever the
product was coming from) on CSX w/o need for interchange. It seems plausible
that in the WM era, these cars could have gone west via Reading and WM. A
little research on PQ's customers might yield some clues.

If it is painted in a Henderson-approved stencil arrangement, it would be a
waste to repaint it, as it is probably quite accurate.

Chris