08-06-2009, 12:17 PM
Digital signals are of an infintesimal amperage, so can move through very thin wires. For any kind of a load,such as a DC motor hauling a bunch of unmaintained cars (like mine.... :oops: ) at 12 v. you will need at least a 20 ga. if you're talking a short run; for longer runs you should use at least a 16 ga. Telephone wire will work, but you will see very poor performance from your locos, and maybe a circuit breaker popping....
Gus (LC&P).