Thank you Bruce, for filling in fantastic extra info.
That shows car 43386, the other car listed in the 7-37 ORER, note PPP as exceptions in the 43191 to 43690 series F-50-12 cars with greater capacity.
See my post earlier in this tread.
I tried plugging in to the Huntington Library site and searching for more photos on this installation but found it difficult to navigate.
Are there more photos ?