Want to give a shout-out to our nation's top O-scale technician, gunrunnerjohn. I had two Lionel Union Pacific TMCC F3 ABA sets, and both F3As failed, one after the other. I had also purchased a matching powered F3B and after a few days of running, problems with it occurred. So, over a period of several weeks, I had ended up sending him all three units.
One F3A needed boards that are no longer available, so I sent him the other F3A which had a different set of problems. Thanks to his expertise, he was able to switch out parts so that one perfectly working F3A emerged. Then he fixed the powered F3B. I received them today and made my prototypical lash-up for UP's Yellowstone Special train. I ran it around the layout with its 7 aluminum car load and both powered units handle the train effortlessly. It's nice to have two powered units, or four motors doing the pulling now, instead of one. Just like with my Lionel Santa Fe Super Chief.
So, many thanks, John, for making this a running train again. I was afraid all of those engines were about to become shelf queens. You did good and I am most appreciative.
So, this is what train I ran today, thanks to gunrunnerjohn.