The track is Peco Code 75, and the points are Large Electrofrog. The frog polarity is controlled by removing the switch rail jumpers to isolate the frog and using a micro switch to control the frog polarity, pending which way the point is set. A jumper was soldered under the point and the switch rails are alive all the time while power is applied. Sidings and loops are isolated by inserting insulating rail joiners between the point and both the joining rails at one end and live joining at the other end, then switching the point to the other direction. This then makes the loop either 2 + or 2 - rails so nothing moves. At Narellan, I can isolate trains on all 3 tracks at the one time.
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| Point direction wires |
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Jumpers under the points
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Polarity Switch for the point frog
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