Bob It reminds me so much of the HO Round House loco I still have.
Carey I made more measurements on the ScaleCraft K4, the boiler diameters are right on for 17/64 scale, if you lengthened the fire box 11mm at the cab end, and puled the cab back 4-5mm the whole thing is spot on 17/64th. Its like ScaleCraft changed its mind on scales. The frame is 1/4 scale but the cylinders are okay for 17/64th. ( cTr....Choose the Right )