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The front end of the truck is lifting for a reason - something must be either bent or jamming against something else. I would check that it's not jammed against the chassis anywhere and that the mounting isn't bent - I had an N scale 2-6-2 which wouldn't pull anything and ran badly, traced it to the lead and trailing truck mounting arms being bent. Bear in mind that you want just enough weight on the truck to keep it on the rails - any more (or too stiff a spring) and it'll lift the lead drivers off the rails. Hope this helps! <br /> <br />PS. Regarding the original "Hogwarts" - in my experience the main problems with Bachmann OO steamer mechanisms are with wheel quartering (seldom correct from the factory - I've seen a few brand new examples tested and been appalled, the one I have took about 6 months tweaking to get running properly), and also out-of-gauge wheelsets. Set both of these correctly and run for an hour's break-in in both directions, and you should have a smooth-running loco. Hoping this might be of use to anyone trying to fix one of these!
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