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Joe, Assuming you have no reversing sections on the layout (post me again if you do), you just need to have one common rail attached to the common bus wire at several locations along the main and one bus wire for the other rail which would be connected at many points along the main to the other rail. But you want to be able to turn off some parts of the track from time to time. Each of these sections will have to have their own power wire on the other rail (opposite the common rail that is) and a switch to turn them on and off. My recommendation is this based on the size of your layout you run a 16 or 18 gage wire from the power pack to the switches and from the switches to under the table (these are the bus wires). Then attach a 22 gage wire to the rail and connect it to the larger wire under the table. It is unlikely that you will need to be concerned with the size of the switches you use (only a tiny PC board switch would burn out under this load) because almost any toggle switch sold will handle one amp of current. Good Luck - Ed
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