Nick,
I ordered a 6-83003 Penn Central Dining Car and the dealer called stating that all seven that he had have hairline cracks in the window body shell openings. (Not scratches in the glass, actual shell cracks in the window openings.)
The dealer's best car has five cracks. The worst has about a dozen. How does your 6-83003 car compare? The cars may have been removed from the mold too soon or late, creating the cracks. If your Penn Central Dining Car is good, I may order from another dealer. I would like to finish my seven-car Penn Central set.
Sincerely, John Rowlen