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I've got a 23.5" r helix with a 2.4% grade and run a Genesis Challenger up with no problems. A 12 car intermodel train (properly weighted) requires 1 road diesel to pull it up and with 2 diesels I can do over 20. It offers some interesting possibilities like using helpers if I want a longer train, but overall I'm happy with it. I've been testing for over two months on it.
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