Carl on his site has a fix for this problem going over switches on Af hi rail switches. I have came up with a simple fix that works to allow the rear wheel set to have more downward travel ( freedom to move). Simply loosen the screws on the truck frame and add a shim. I use a piece of business card. It slides in between the gearbox and bottom plate at the rear wheel set. Works every time. Only at the end of plate. About 1/8 inch by width of plate
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