Haveing said I was going to build a USRA Pacific this winter I have hit a block. What I thought was the start of a Pacific turns out to be a Mikado Put that down th senile decay!!! That as it may be, when I start editing the engine bin file and add trucks (bogies) the model disappears. when it gets anywhere near to the track. Any sugestions??? I have been using my UP 0-6-0 as the basis.