Said another way, in a simplied example where there is only an AIU with a direct connection to tracks (that is, no intervening relay), the PBW would be connected to the inputs to the AIU and the signal is only received by the track that is connected when the AIU internal relay is energized. In that example, and assuming no AIU relays are closed, and with the transformer having its handle engaged, the PBW would actively be generating a signal since it’s positive and negative is connected even though no tracks are powered.
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