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[quote user="rrinker"] Few if any of the schemes that use IR sensors can duplicate the 'car somewhere in a block' detection you get with track current sense methods of detection. [/quote] None do unless you use the bounce detectors (ones that point up at the bottom of the car) every (insert shortest car length) across the whole railroad.   [quote user="rrinker"]So even if the propulsion power doesn't come through the rails, some power needs to flow there for block detection.[/quote]  This makes battery power redunant in my mind, because all the problems it solves, are still problems (=>solves nothing).  Kind of like keep alives.  I have always said that they are neat, but just a band aid solution to the actual problem (be it broken pick ups, insuficient feeders, dirty track or dirty wheels).   Taking the control circuit off the track is a logical step blutooth, or radio now can fit in a locomotive.
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