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Oil on the wheels and on the track. Ick.
Well, the oil had no effect at all. (I was shocked, frankly).I think I may have to take some close-up video of it going over a frog and post it. It will be easier to understand onceyou see it. Heck, looking at close-up video may allow me to see something I don't see live.Next up, I may pull the front drivers, just to see. If it stops doing it, I'm not sure I've proven it's the front wheels.But if it doesn't stop doing it, that would be a good clue.
What about leading and trailing trucks? Maybe the back of the flange hitting the frogs? I would think that the weight on the drivers themselves would squash any resonance from a squeak unless it was bone dry in the bearing blocks. The S.
Max mentioned removing those early on during testing. I assume that they are still off the loco.