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One possibility is that the motor is sitting incorrectly inside the shell, causing the flywheels to hit the inside of the shell as they turn. Run the locomotive without the shell, and if you do not hear the buzzing, make sure the motor is fully seated and sitting flat. If you still hear the sound without the shell, inspect the drive shafts, and dissassemble the trucks and inspect the gears for any flaws or excess plastic. Josh Ziegler Spokane WA
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