Jeff: Thank you so much for the explanation. I believe I understand, at last. As I said I am a real novice at this electrical stuff & I don't want to electrify ME or weld my trains to the track. One other question. I will still electrify the rails in the WYE complex just as I would any other rails elsewhere but they are all electrically isolated because of the insulated rail joiners but are electrically "correct" because of the reverse loop module that only needs to be connected to the tail of the WYE and will electrically supply the proper polarity as the loco passes thru. OK?