Thanks for posting the video charlie. I think I saw something I have never seen before, a composite side covered hopper.
The Milwaukee's Adair Loop rivaled Horse Curve as America's greatest train watching amphitheater but nothing could rival Horse Shoe Curve for traffic. It is hard to imagine how many pieces of mail, let alone everything else, traveled over the curve every day in that era.
I sure wish we could watch a video of Rich and the 765 double heading with Milwaukee 261 on the Adair loop!