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You got the grade right. What you missed is that a 100" Challenger in HO just doesn't make sense; it shouldn't be over 2 feet. HO is 1/87 (i.e. 100 feet long in real scale is only 1.15 feet long, not 115 inches long. Hope this helps. <br />Just to let you know, not confuse you, grade is simply a fraction: rise/run (just take the distances ascended or descended and divide by the length. It doesn’t have to be measured in 100-foot sections although thinking of it that way makes it simpler. <br />James[C):-)] <br />
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