I've got the LionChief Polar Express 2-8-4 Berkshire and the motor is mounted such that worm is forward of the worm wheel on the rearmost drive axle. Therefore, the worm "pushes" on the worm wheel in the forward direction, causing the motor armature to move upward and the flywheel with it. Assuming the motor in your 0-8-0 is mounted the same way, your flywheel may be scraping on the locomotive shell in the forward direction, as @Vernon Barry suggests above. Depending on your tolerance for disassembly, you could remove the shell and check for wear points above the flywheel. Then you could gently file (or Dremel, if you have one) at those wear points to increase the clearance. It should take less than a millimeter if this is the case, since your loco is not slowing significantly during the scraping episodes.
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