NWL : Ha! OK my mistake continues to cause consequesnces. I apologized to Robert Butler so I should also apologize to yor as well. SORRY!
You know however that I actually looked through my pictures for an AF cattle car and could not find one from the pre-war/ pre-Gilbert era I also made a cursory check in Greenberg's Collector's guide to American Flyer "0" gauge and could not see one referenced there. So lacking an 0 gauge representative I checked my only reference book on American Flyer "S" gauge and found 7 or 8 varieties of stock car but since I don't really collect "S" gauge I have no pictures. Obviously my collection is deficient! However in a pinch, since we know the very early connection between American Flyer and Hafner, perhaps as a stand in, here is the Hafner cattle car from his "Streamliner" era.
Best wishes
Don