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Alright. I'm confroosed on this grade stuff. In HO scale, a percentage of grade is measured in 100 inches. I got that much. 1% grade means the track rises 1 inch in 100 inches....2% is 2 in 100 inches...and on and on. I got all that. Ok boys, here is where it gets for this old boy. The length of the Union Pacific Challenger is 106' 8". That's prototypical scale....real life, if you will. If the Challenger is supposed to be over 100 feet long, why do we use 100 inches in HO to equal 100 feet in prototypical scale? It just don't add up. Looks to me like we would need to use about the length of the Challenger. I mean prototypical 1% grade rises 1 foot in 100 feet, right? Then to be correct in HO, the track would need to rise 1 inch in about the length of the Challenger in HO. What am I missing?
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