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I dug out the instruction manual for the "Keller Engineering Onboard Locomotive Sound & Control System ". Copy wright 1984 . In which he explains "counter emf " as he called it . Along with a simple diagram . I would say this is prior art . This was pretty high tech at the time . Certainly predates MTH as well as others . <br />I just cast my vote by buying an NCE dcc system for my HO layout . I'm also into O scale . No MTH for me . Not now ,not ever ! It's a matter of principle . Don't like the way MTH does business and will never suport them . There's plenty of better products out there . <br />Joe <br />
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