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I also once built a boxcar with nickel metal AAA battery pack that charged through a full wave from the track and supplied power to a loco through wires and a MOSFET power cord from an electric RC plane throttle radio control. Worked great on dirty nasty track from up to 1/4 mile away. Downside, couldn't keep batteries up over 20 min. even suppling power through clean track. Guy who loaned RC stuff wanted it back and told me what they cost new. Made DCC seem cheap!
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