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Yep, a decent flat spot, obviously had been dragging for a while.
Though, no scale build up.
Scale build up can derail a wagon when the depth is similar to the actual wheel flange.
Our old NGMA (wheat hoppers) were notorious for sticking brakes.
Brake piston travel was some times extreme.
This would result in sticking brakes after a minimum train brake application and release.
The brake piston not retracting fully and causing dragging brakes on that wagon.
Steve.
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