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It's possible your controller has a fixed DC output on the back. Check the back to see which screws the track wires are connected to. They should be wired to the pair that is regulated by the throttle, and no other pair (the terminals will be labeled "variable DC", Fixed DC", and "AC", or something like that) Even a bit of the track wire just touching a fixed power screw will set the locos permanantly on full speed. (I've done it before [:I]) <br /> <br />Make sure the wires ONLY contact the main variable outlet. <br /> <br />Of course, if I'm wrong, and there is no fixed DC outlet, the power pack has a problem.
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