I have been working on some Stewart G39 Ore Jennies, and here are 24 of them behind a Stewart C630 & C628. These pictures were taken at the Strongsville Model Railroad Club.
Here is a video I tried to make showing all the 24 ore cars.
Rule 1: This is my railroad. Rule 2: I make the rules. Rule 3: Illuminating discussion of prototype history, equipment and operating practices is always welcome,but in the event of visitor-perceived anacronisms, detail descrepancies or operating errors, consult RULE 1!