I made a blooper bidding on some IM boxcar kits at an NMRA division meet. I wound up with 3 1957 built B-50-52 PS-1 cars instead of cars I could use built as is in my pre-1955 model era. The kits only cost me a total of $14 for the trio so not a great financial loss. I didn't realize how late they were until I got home and started some research. Relying on uphs.org/boxcars.htm, the only UP Pullman box cars built prior were the B-50-40 series from 1948. So the question is can these be backdated from a B-50-52 to a B-50-40 at least superficially?
I would need
The kits were old enough that they were marked "Manufactured in Colorado by Intermountain Tooling Specialist Inc."
Your comments are always tolerated in spite of my thinning hair and skin.