Hmmm... quite a messy disappointment, heh ? I have a couple of these and the Terry’s nylon worm was a true improvement. But using the same material for both worm and drive gear invites wear. You may be able to clean the shards away and enough axle gear may remain such that proper meshing may result. Depending where the wear is greatest, you may be able to move the worm up or down on motor shaft such that mesh increases to the point they will run. Use lube on these gears... it’s critical and essential. Also be certain the mechanism - with the motor/worm disengaged - rolls smoothly and easily. I’ve seen these locos with “tight” tolerances on the drive rods/screws... “tight” as in zero tolerance... such that the mechanism is frozen solid. A small rat tail file on the drivers or even re-drilling the journals a few thousandths of an inch gives needed free rolling tolerance. Wish we were closer where we could open it up in the shop to see for certain ! Good luck !
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