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Unless you intend to run your trains in one direction only on one track (a la Cajon Pass), the same consideration should be given for adverse (uphill) grades as for favorable (downhill) grades. In other words, that uphill grade will have to function as a downhill grade sometime, so the "maximums" will be identical. On most model railroads, unless you're modeling a specific location where the grade was steeper, such as a narrow gauge or logging raiIroad, I recommend a maximum ruling grade at or less than 3 percent. That's a rise or fall of 3.6 inches in 10 feet. I prefer 2 percent or less. Remember that the steeper the grade, the longer the vertical transition curves you'll need at the top and bottom of the grade, and those vertical curves can and do eat space.
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