I figure somebody out there probably has the Morning Sun books on PRR and PC freight equipment.
I'm trying to get an understanding of the differences between the PRR F36 class and the PC F36A class and how that came about. PRR car numbers on the F36 class appear to be 470208 to 470235; the PC F36A class appear to be 770500-770527 although only 12 show in 1974.
I'm just guessing that somewhere in there they got rebuilt from 250K capacity to 277K capacity and called class F36A, don't know when, or by whom, but I need verification, so this is the time for the real PRR / PC fans to step up. I've got an amazing prize for the winner!
By the way, these are the 1941-built six-axle, clear-deck flatcars that sorta-kinda look like a DODX tank flatcar, and it even looks like they stole the design. I'm guessing that was the primary mission for the cars - heavy military moves, particularly since the WWII build date. I'd love to find a book photo of one loaded up with a WWII era load, if that exists.