I am new to the z21 system. (Truth be told, I am new to everything about model trains). It seems all my locos are are programmed for the same address: 3. So, I can't run more than one loco at a time. As best I can figure, I need to program each loco with a different address. And to do that I apparently need a programming track. Where do I get this track? Is there a good tutorial somewhere on the web for how to do this?