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  1. N Scale
    I have a Kato SD40-2 that runs very slow max speed and does not begin to move until throttle is about 25% or more. Further, it slows at about 50% throttle and them jumps back up at about 60% throttle. And even further, the speed steps on my throttle jump by 3s. For instance, speed steps 3, 6, 9...
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