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Imagine connecting two relatively heavy (lamp cord size or so) wires to your power pack, and running them under the table so that they follow your tracks. These are called the "bus" wires. The bus wires can carry current a lot better than you tracks, since there are no rail joiners, etc. in them. <br />Next imagine every once in a while running smaller wires (telephone size or so) from the bus wires up to the tracks. These are the "feeder" wires. Even though smaller than the bus wires, the feeders wires are short so their resistance to the current is minor. <br />Hope this helps. <br />
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