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Whit, <br /> Welcome back to model railroading. I don't quit see the complicatedness (if that is a word) in your original question that some of the others have answered. In asking about grades in percentages, in real life a one percent grade rises one foot every 100 ft. 2%= 2ft in 100 feet,3% is 3fett every 100 ft., and so on. I hope i made that a little clearer. HO scale is 1ft = 3.5mm or almost 1/8 inch. That is for the math part. If buy chance you had a good pubic library in your comunity, they very often have a decent selection of model roalroad books. I would check there first before purchasing one. Oh ya, helper service is using more than one engine to pull or push your train up a grade. Happy Modeling to you.....Jamie
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