Yes, the Kohs coal load does seem to violate the coefficient of slide. Perhaps the Korean builder thought the UP employed some water thinned Elmers to keep their coal loads in place? !! I have noticed that Sunset 3rd Rail coal sizing varies from appropriate 3-4" up to bowling balls! It's funny - - I have friends who essentially bought every steam locomotive produced by Precision Scale, and the more they studied each locomotive, the madder they got! "For God's sake, the incombibulator is 3" too short", etc. etc.
Guess we have to remember that we could build our own "perfect" locomotive models from scratch. If I were to have tackled a UP 4-6-6-4 with the level of exquisite detail as on this Kohs model, I would have a had to start the model at approximately the time of Cleopatra's rule!
