I'll get right to the point.  I bought this engine used at a train show.  The vendor said it worked perfectly.  I wanted it so badly I bought it on the spot.  Well got it home and it wouldn't pull any cars.  The little gear set was missing the outside gear.  Also the sound wasn't very good.  Ordered the gearset and a new speaker.  Put in the gearset and it pulls fine now.  The sound:  can't get the horn or bell to work with any of my transformers and it might blow the horn or bell just randomly going around the layout.  Also the engine does not rev up with the speed of the engine - maybe that's not a problem.  Should I just bite the bullet and buy a new rs module?  $45 plus shipping.