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The easiest way is to have a grade between 2% and 4%. Any more of a grade and some of your trains will have difficulty with the grade and the angle. Here are some rough numbers on the grades. All are based on a 9" piece of track. 2% Rises 3/16th" and requires 16 to go over another track. 3% Rises 1/4" and requires 12 sections to go over another track. 4% Rises 3/8" and requires 8 sections to go over another track. Hope it helps and good luck, Dave
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