Overall, I am happy with the trucks. One area I was concern with was the truck width. As I had trouble understanding the clearance I needed for free rolling of the axle, and the axle is too tight.
I am going to have to widen the truck and print a new batch.
Here are the photos showing the trucks with and without wheel./axle and you can see the issue with width.
I also went ahead and mounted a set on one of the hopper car to see how it all looks
The hopper car is also 3D printed, but not my design. I purchase 3 of these from this shop
https://www.shapeways.com/product/29NB7BAHM/tt-scale-2-bay-hopper-8-panel-v2?optionId=59706661
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