I'm trying to repair a couple All Nation engines. They have been run quite a bit but with one exception they seem to run fine once they were cleaned and lubricated. One of the engines has one truck that keeps dropping the transoms. The side frames do not appear bent, and I have even swapped out side frames and the transoms continue to fall out. This only happens on one of the trucks on one engine, the other trucks and engines I have work fine. I have made sure the clip is properly engaged on the problem truck.
Operationally it doesn't seem to make a difference, the engine does not derail, but then I haven't run it that much because I wanted to resolve the problem.
I included two pictures, one side view of the disassembled parts and another to see how it looks assembled to show what part I'm talking about in case transom is not the right part name.
