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Interesting - My Athearn GP60 and F7 are my two quietest Athearn locos, perhaps this is why - GP60 has a steel weight in the dynamic brake housing, F7 has a hefty diecast weight over the motor. I'll have to try adding extra ballast to my other locos. <br /> <br />Another Athearn-related problem: I have two or three locos that vibrate a lot when running - this is obviously the cause of the noise and is related to the motor speed. I've looked for flash on driveshafts and other parts, and tried the "toothpaste" trick to quieten the gears down (it does work, they are now a fair bit quieter), but they're still a bit rough due to this vibration - anyone got any ideas? I'm wondering if the motor and/or driveshafts may not be balanced as this tends to cause similar problems in full-size vehicles.
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