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I have a Bachmann 0-6-0 in N scale that also uses a worm gear and it did the same thing. It ran great in reverse but wouldn't go forward. It turned out that the brass worm gear had too much slack against the plastic spur gear and it jammed going forward. I had to gently bend the frame on that loco to fix it. If I recall, I also had to shim it. It took a lot of trial and error but it worked. I ended up retiring it from my layout anyway since the undercarriage hit the switch machines on my track! lol Hope this helps
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