Photo: PFE 23220 (R-30-12)
A photo from Trains Magazine:
"Pacific Fruit Express was co-owned by Union Pacific and Southern Pacific. This 40-foot class R-30-12 car, built in 1923, had a wood body and steel underframe. It was typical of the thousands of “modern” refrigerator cars through the 1930s.
Photo by Standard Steel Car Co."
Cars in the R-30-12 class were built in 1920-21 by five different builders (2,000 cars) with another batch (6,800 cars) built in 1922-24 by six builders.
Some of these cars eventually were rebuilt into other classes with new car numbers.
There is quite a bit of information about these cars (with photos) in the PFE book.