Gary Laasko wrote:
"This picture appears to be the B end of a rebuilt NKP (only the N on the reporting marks shows) double sheathed boxcar:
https://www.loc.gov/resource/fsa.8d12117/

Fail. The car has NOT been rebuilt, and you can make out an oval on the car side. NOT NKP, but NYC, specifically NYC 234700-234945 (ex-T&OC 14000-14249), Lot 386-B USRA DS boxcar

Ben Hom
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With the distinctive NYC system vertical board through both door stops to make a solid surface for the door to open against.

Dennis Storzek