As to the boxcar, one from this series is on display at the San Luis Obispo Railroad Museum in California:

https://www.slorrm.com/QR-1200PCRy.html
Advisory...A Plug.
If you are in the neighborhood, check out this and other cars on the property, especially during the Central Coast Railroad Festival on October 7-9:

https://ccrrf.com/schedule-2022.html
For the tenth year I will be organizing a free, self-guided tour of model railroad in San Luis Obispo and northern Santa Barbara Counties. We had 29 railroads on last year's tour.
Bob Chaparro
Hemet, CA

Here is a car I have not seen before, Case Threshing Machine Co. flat car No. 503. This photo was taken around April 1924 after Pacific Car & Foundry had built 3' gauge box car No. 1202 for the Pacific Coast Railway in California. Pacific Northwest Railroad Archive Collection.

Richard Wilkens