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Grade (rise/run) for HO bridges
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It's going to be tough, because I was able to get mine working OK, but mine's an 8X9, not a 4X8. I used the cookie cutter approach (see previous post) where I dropped the lower track and raised the upper track the same amount to get the over/under. I run steam equipment, so I cheated on the clearance, no double-stacks allowed! Even still, it's tough getting up the grades with a long train of 18 40-foot cars. You will probably run a shorter train, so that's good. Do whatever you can to make the grade as gentle as possible, within your limits. Also, Try to do 5X8 or something just a LITTLE larger, even if you have to overlap 6" of bare plywood over the edge of the frame, like I do. It works, and things are less crowded. Research your track plan, try a folded dogbone plan to get the most distance to your incline... check out Atlas' track plans, then modify one to best suit your preference.
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