Well, we went out to see what we could see and found a very large group of UPs hooked up to a very long, obviously very heavy, load of hoppers full of gravel. Since we are modeling a gravel area, and are using UPs, we couldn't have been happier with our find. Here are some pics.
A very large grouping of UP engines were hooked up to a relatively small number of cars and were moving up and down the rail switching the cars onto various tracks. I've never seen this type of operation before -- the engine group would move forward, then a guy would jump off the back of the train and throw the switch, then the engine group would back up, literally unhook and throw off the back four cars, which would go careening down the track un-attended, and they would slowly stop in EXACTLY the right place, just on their own rolling power pushed off previously by the locos.