Trolley, grinding noise

[rperego]

My Bachmann Christmas Trolley produces a grinding noise - since new 2 years ago.  I didn't know if it was normal until hearing another one run.   The noise is the same on straight and curved track.

The gears have been properly lubed and I can't see any obvious problem.  The gears look OK and the lash appears to be about the same on either side of the motor.

Any suggestions on what to try?

Thanks, Bob

[the Bach-man]

Dear Bob,
Try some LGB blak gear grease. If it doesn't quiet down, contact service.
Have fun!
the Bach-man