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My friend's 4-8-8-4 HO Big Boy hasn't been run in a while, and when we ran it on my layout the other day, there was a high-pitched squeal in the mechanism somewhere, but only about half the time. I disassembled it, lubricated (lightly, of course) all the moving parts and noticed that the gear boxes had plenty of lube visible. Every part (motor and both driver sets) ran smoothly by itself, but when back together, it squealed again, still only occasionally, with no discernable pattern. Next, I filed off some really small flash lines on the plastic "transmission" couplers between the motor and the gearboxes. This seemed to help, and I ran it for about an hour; then after a 30-minute rest, it started squealing again. Can anyone suggest an answer?
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