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Paolo - your math is correct, but 5% is steep enough to look like a steep hill, which the prototype roads didn't have - except for logging and mining roads, which were often narrow gauge. It will also cause a significant reduction in pulling power of your locos. If you are running 30-40 cars, don't count on getting them up all in one shot unless you have lots of helpers. Having said that, if your 5% grade is hidden, and you are running short trains, and you need to gain altitude in a hurry, then go for it... Andrew
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