Tim,

The US Army Ordnance Depot south of Baltimore had what appeared to be an old USRA (or later knock-off)flatcar in their yard for years, archbar trucks included. I got the B&O Museum interested in it, thinking it may have been an ex B&O car, since this was their connection to the world. We all were surprised to later find out the car was ex Texas & Pacific!

That's a long way around the barn yard to say the Air Force gon could be from anywhere. MBuckelew hoghead32