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Ok. You will want 4 inches of clearence between your bridge and the track passing beneath it. If the track crosses over itself in exactly the middle of the 5X8 layout You can probably use a 2% grade. Which will take 16 feet of run to rise it four inches. You can use 3% if you want to raise the level in 12 feet or Run, and you can use 4% if you want the rais the level in 8 feet of run. Woodland Scenics makes track risers and inclines to assist with this task. <br /> <br />James.
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