Kato SD40-2 motor problem

[Herc Driver]

Yep, that's the case. To me the easiest explanation is the rear truck is not allowing the power to flow from the rails to the motor via the metal conductive strips. As far as I can tell, when the engine is on the tracks, the metal strips are touching the points of the contactor. The rear truck is also seated correctly. (This is the new Kato "snap in" truck assembly.) The engine isn't very old and spends its time inside the protective box. So it doesn't face the heat/humidity/cold like something just remaining on the layout all day would. But just in case, I'm going to clean the metal strips. I'm going to figure this out, probably by process of elimination, as soon as I get back home in a few days. Thanks for everyone's ideas to fix this problem...I really appreciate it.