I have no knowledge of these cars, however, if the drawbars (read...couplers) are truck mounted...there is the problem with pushing!
Any truck mounted drawbar in any scale will have this problem because the pushing force is imparted to the truck, not the car body, making it tend to skew (even on a straight line) and thus derail.
If the drawbars/couplers were body mounted the pushing force would not be directly transmitted to the trucks leaving them to rotate in the curve on their own and exponentially reduce the tendency to derail. I learned this many years ago while in HO.
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