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we are working on doing just that - elect. engineer friend made a plan using Radio Sh. stuff - Ea. track has a photo transistor @ rail level on outside of rail, against the rail so wheels will not hit it. Then a 1.5 DC, 330 ohm. 1.4 W, LED mounted in the same manner on corresponding rail on turntable. The beam is quick enough and focused enough that for practical purpose the rails will allign sufficiently for the locos to pass. <br /> <br />ken
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