I really hope the museum responds. I can't imagine what it is. Seems like a lot of work to hand make something, that isn't very accurate. As far as I know no PA's never had fluted side cladding, particularly UP. If I am wrong on this someone please correct me. I am always trying to learn more about the Transitional Era.
I really am thinking that someone at GM would have had a fit, if PA's were ever used to pull the "train of tomorrow after UP obtained it. Although is there is a picture of Cladded PA's pulling it I would love to see it!