Does anyone have any sources, tips, guidance, or other suggestions about ways to figure out who the subsequent owner(s) of a prototype railcar are/were, after the original owners sold the car off? For example, railcarphotos.com has fields like 'builder', 'lineage', and 'notes' fields in their search page which can be helpful for this.
I have a model of a UNPX/Procor 4750 hopper that I would like to weather up to follow some proto pics of the car after it was patched for a subsequent owner (if any), tho my search efforts so far have come up short. Seems it may be easier to do this sort of thing for locos, since there is in general more history available for this sort of thing.
Thanks in advance!
Ed