This question comes up quite often. As noted, both early conventional power engines with universal motors and mechanical E-units and later can motor engines with electronic E-units will operate on DC power. In this case, the standard forward-stop-reverse-stop, etc. protocol will be intact. There is one additional option with DC power. To take advantage of the DC polarity control of direction, with universal motor engines, bypass the mechanical E-unit and substitute that well documented bridge rectifier circuit and with can motor engines bypass the electronic E-unit and wire the can motors directly to the pickups. With either of these methods, engines appear to run a bit smoother.
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