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there are a couple of things you can do: 1) solder the wires to the outside surfaces of the rails. If you run the main bus wires under the layout using 14 gauge wire, then you can run shorter lengths of 22 or 24 gauge wire from the main bus to the rails through holes drilled through the roadbed at intervals of six to eight feet. 2) solder the wires to the undersides of the rail joiners 3) your LHS might stock Atlas rail joiners with the wires already soldered to them. However you do it is a matter of your own choice. I prefer to solder to the outsides of the rails. The advantage of using 14 gauge wire for the main bus is that you can extend the current further since it's not fighting against the higher resistance of the smaller wire jumpers. You would want to space the jumpers about 6 - 8 feet, but each individual jumper shouldn't be much longer than 12".
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