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Grade is always expressed in %, as the units for the rise and run are always the same. 1 inch rise over 100 inch run... 1 foot rise over 100 foot run... Most railroads in the past (when built) expressed grade as a rise in feet over one mile, not as a percentage. Bob - where you went wrong was trying to use 1 real inch rise over 100 scale foot run (length of the loco). This works out to be more like 7.5%, since at 1:87 (HO scale), 1 real inch = approx 7.5 scale feet. Andrew
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