Dave: The American Flyer "cow on track" was catalog # 23791 from 1957-1959. It operated differently than I had first recalled above. When the operator presses a button, "Bossy" the cow wanders onto the track, and an oncoming train comes to a halt. When "Bossy" returns to the pasture, the train continues on its journey. Green plastic base and pasture, black and white or brown and white cow. You can tell since I am not including a picture that (alas) I don't have this electric marvel, but who knows in the future. I am sure it can be wired to work with Lionel and the scale on most accessories is so off I am sure it will look OK.
Don
