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Grade (rise/run) for HO bridges
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Given the limited run length on a 4x8, your best bet is to raise the upper track a maximum of 2 to 2 1/2 per cent, and lower the lower track about the same.This means the "base" level can't be on a fixed plywood tabletop surface. Best to either use open-grid or L-girder benchwork, and mount the roadbed on risers.Either that or use one of the newer styrofoam -base methods. There are many articles and books in the model press covering these methods.You will have a much better approach to scenery using one of the above methods. Good luck and regards / Mike
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