Thanks for the kind word Gang. Good to be back active in the hobby after sitting out for several years.
Grant - that is an incredible video! Do you have a layout thread with more information, like a track plan and also how you managed to have mid train helpers and pushers without cars being pushed off the tracks all over the place? Super impressive!
I think there are several keys to keeping stuff on the rails.
-Paying a pile of attention to track work
-Body Mount couplers on everything
-BLMA Trucks on everything with 2/3 of a MT coupler centering spring placed over one axle end on the B end each car
-Speed matching locomotives
-Bigger radius curves, 32 inches and up
grant
The mid-trains in the vid are MU'ed to the leads but usually a separate crew would run them during an op session.