John, I am going to head back home, no way you've held your breath this long (and you can respond on your computer)! Glad you like the tire chart!
Tomorrow I will post a couple documents pertaining to Premier Diesel / Electric, RailKing Diesel / Electric & RailKing Steam motors that show dimensions or worm gears (and more specifically factory worm gear numbers) to help everyone easily identify what motors go to what products. Unfortunately the Premier steam list won't be done for some time to come.....
Thank you,
Mike Reagan
MTH Parts & Sales LLC