Edward:
Basically you connect pairs of power/ground wires from the transformer or powermaster to various track on the layout. Opinion on how and where to make the connections are numerous. All are sound. I connect power/ground before and after every turnout and every 4 feet of regular track. I also alternate ground connection to both outside tracks or simply connect to both so I don't have to depend on the train trucks for the connection (overkill). The easiest way to connect multiple power/ground wires from your transformer is to connect one pair of heavy wire set (12-14 gauge) from the transformer to a terminal and then branch out from there to the track . Types of terminals include MTH 12/24 post (expensive), Miniatronics 12 post (cheaper), ACE/Home Depot standard terminals or European style (what I use).
Fastest way is to connect power/ground is to use Atlas O rail joiners that come with wires already attached or to simply solder your own. However the rail joiners are prone to loosening up as you will soon see when you start connecting track together. I have gotten around this by using a product called split jaw connector - see photos below. They take a little work. You have to ask for connectors shaved off a bit so they fit in-between the Atlas O rail ties. You also have to remove the plastic underneath the rail you want to attach the connector to (10 seconds with a razor saw and you are done). However the end result is a rock solid electrical connection. The size of the crimp connect will allow you to use up to 16 gauge wire if you want. The last picture below shows how I set up the connection. I go from a 18 gauge wire to a wire ferrule then crimp to the female crimp connect that comes with the connectors. Even with the above 'hassle' I like this method better than soldering wire to the rails.
Joe
