There are 2 main reasons I prefer to have FasTrack switches wired on their own separate bus, powered at about 14 - 16 volts AC. This allows a different track voltage (good for conventional and command). The other reason for this electrical separation is that in addition to having TVS diodes installed in appropriate locations around the layout, keeping switches on a different bus helps protect the electronics inside them from the transient voltage spikes on the track power circuit caused by a derailment.
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