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[quote user="SeeYou190"] I have a Bachmann 2-8-0 that has the exact same sypmtom as yours. It clicks going forward and seems to run "ratchety" about once per driver revolution. The locomotive is silky smooth when running backward. . My probelm started when the locomotive was running forward pulling a short train. A truck mounting bolt on one of the freight cars backed out and caught on a grade crossing and stopped the train dead in place. In my case I am sure the problem is not because of a collision, so I never checked side rods, valve gear, or any of the like. . Mine is an original release of the Bachmann Spectrum Baldwin 2-8-0 without DCC or sound. It was my favorite steam locomotive before it failed. It has been back in its box for at least ten years now. . I am interested to hear what you find. . -Kevin . <div style="clear:both;"> </div> [/quote] Kevin, I found that the gear on the main driver was chipped/severly worn.  This causes the ratcheting sound because the brass worm is trying to turn the main gear, but it misses the valley between teeth and strikes the tooth.  Replacing the driver set corrected this.  I will still need to delve further into the drive train to find the the other noise, which I suspect is a side or main rod striking one or the other.
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