Thanks everyone....you gave me the 'shop orders,' now it's time to grab the tools.

I have  Spectrum 2-8-0 Item 11410 (DC only) engine. When on the track, the motor runs but the locomotive won't move. Makes a sound like the cog belt is slipping. With the motor assembly out of the model, one can turn the belted pulley and the motor shaft turns. The locomotive driver assembly moves freely. When reassembled, it will not move as noted above. I think either the cog belt slips under load, or perhaps, the belt pulley is slipping on the motor shaft under load. I have not disassembled the motor assembly...yet. As there is no cog belt listed in the instructions, it appears the entire motor assembly must be purchased to replace the belt...a very expensive proposition. The engine has been custom painted so I prefer not to send it to Bachmann's service department. Also, I CONTACTED Bachmann service about a week ago but so far no reply to my inquiry. Is this a common problem with the Bachmann cog belt driven engines? Any suggestions?