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[quote]QUOTE: Originally posted by CoBo Just curious, since I want to start a US modelRR, wouldn’t the powered helper derail the car's if the front locomotive’s go upgrade??? [/quote] You would think so, but as long as the helper engine isn't faster than headend units you'll be fine. As the front of the train starts upgrade, The slack in the last cars will compress. Think of a spring going together. If your cars are properly weighted and you have sound track you'll be fine. Andrew
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