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Joe, The answer to your question depends on two conditions: How big is your layout and are you wiring it for multi-cab operation with blocks of track or just running one locomotive? Either way, you should use a larger size wire under the table to decrease the voltage loss in the power system. You can use smaller wires to attach the bus wire under the table to the track. If you are wiring for multi-cab operation then you will need one 'common' bus wire attached to one rail of the track in several locations along the layout. You will also need several other bus wires under the table to power the other rail in each block. One bus wire will be needed for each block. The size of the wire is dependent on the size of your layout. If you are wiring for only one cab, then you will need only one bus wire under the table for each rail. The bus wire should still be connected to the rail at several locations. The modelers I know use either black or green colored wire for the common bus wire. Red or white colored wire is frequently used for the other rail. If you are still confused, I recommend that you read Andy Sperandeo's book Easy Model Railroad Wiring. Good Luck - Ed
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