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Big help from Circuitron... Ok, it really was just feedback from Steve at Circuitron. Their DT4 comes with 4 optical sensors. He said each sensor triggers an SPDT switch basically. So when the sensor is covered, it opens the switch to ground. It can handle 10 to 18V DC. This opens the possiblity of triggering an attached relay to send the appropriate signal to anything the relay is in line with. I have a DT4 coming and will play with it and a couple of relays to change the track to DC from DCC. By then setting the locomotives Prototype braking, Digitrax says that when the loco sees analog, it will begin it's braking, but keep it's lights on, etc... (Cross our fingers.) I am going to build in override switches in case the sensors malfunction, or receive erroneous signal. It is then theoretical, that a DP162 could be "tricked" into receiving a current draw when the block is occupied (a little electronics and an additional relay, which would signal Loco Net.) I still need to understand what to "show" the 162, so I will be calling Digitrax in the next day or so. (Unless someone get's enterprising and calls them first.) The simple relays to cut DCC and apply DC shouldn't be a problem, but my concern is they will AUTOMATICALLY kill the stop block, regardless of operator intention. Not entirely bad, it is actually prototypical on the main. Now, how do we make the yards and industry behave.... Keep talking and thinking. We are on to something here!
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