alco's forever!!!!! Majoring in HO scale Minorig in O scale:)
You need a block section going to the siding. You can insulate the center rail from the rest of the layout with insulating "fiber" pins, replacing the steel ones (assuming you're using tubular track), then connect a wire to each side of this break in current and put an on/off switch between the two. This would allow you to shut off track power to the siding when you want, or turn it back on when you want.
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