That must have made for interesting running!
Thanks for all the coaching Pete and GRJ! Made the traction tire switch - MTH tires now on the grooved front drivers. Got all the drive rods back in the correct order and tested it. Works like a charm and goes through the problem switch without derailing. I’m a happy camper. Thanks again for your prompt replies and willingness to guide and encourage.
GRJ - do you have an opinion or evidence as to whether the new Lionel Legacy Moguls would operate on O22 switches? I've queried Lionel, and they say no, but I'm wondering if there might be a fix.