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[quote]QUOTE: Originally posted by WickhamMan Back EMF is basically a cruise control feature. It keeps the engine running at a constant speed over uneven terrain. I have a BLI Hudson and can attest to the problems keeping it on the track. Especially troublesome are turnouts and downhill curves. I have only a slight downhill into a curve and at any reasonable speed, the engine derails once every 4 or 5 passes. I am curious as to how to shim the engine to put more weight forward to avoid this problem. Does anyone have any specifics on how to accompli***his as RailGuyHO suggested? [/quote] I do not have any spef. but if you remove the trailing truck you will find a spring and a washer all I did was change out the washer for one about twice the thickness.This pushes the cab of the engine up the thickness of the new washer,thereby pushing the front of the boiler down putting more pressure on the front pilot.And you can do this without losing all the weight to where your engine wont have any traction,The New hudson I put on the tires the old version I did not,tracking was improved greatly,on both and the older hudson I really could not see where I lost any traction. All I basicly did was limit the travel of the spring under the truck. I think the Hudon is just a little off balance where rear wheel weight compared to front pilot tracking is concerned,If you are having problems with your hudson tracking watch it closely at the rear of the cab as it goes into a turn,watch how far the back of the engine drops and raises the front pilot.so by limiting the amount of travel on the spring under the truck you can control the weight on the front pilot a little better.If you don't want to double the washer size you can make shims out of thin stryne cut and drill insert on top of the washer under the truck. untill you get the disered effect that works best for your track work. I enjoy my hudsons but they were problems I did not want to add weight to the front pilot and take away from the looks of the engine so this is how I solved my tracking problem I hope you have as good of results with yours if you try it as I have had with mine.Terry
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