Bill,
I guess you could say the modules were built to a standard that was patterned after N-trak...with modifications. Our operations are entirely DCC, so much of the wiring required by N-trak is redundant. Our "standard" module is built with two tracks although some of the modules have three tracks and could be made compatible with N-trak with minor changes. We used European terminal strips on the end of each module, and just used a section of wire to connect modules if connectivity was a problem. Most of time the railjoiners provided an adequate connection.
A few of the modules have Cinch plugs like N-trak, so I took some lamp cord and made some "jumper" cables with it. I striped the wire on one end of the cable and connected it to the Europeon terminal strip; on the other end I attached the required Cinch plug depending on the adjoining N-trak module's requirements. I hope that makes sense. If I think about and have the time, maybe I could take pictures if it is unclear.
Here is a link to some pictures that shows the track configuration of the modules:
http://www.railroadforum.com/forum/topic.asp?TOPIC_ID=5875
Four of the modules used in the show belonged to me, but all the modules were worked on by club members with most of the work being done at one location, so there is some similiarity. We wanted to have things look like they fit together, and the layout was built with the 12 module core designed with that in mind. At the last minute (actually with three weeks to go to the show) I decided to expand the layout with the peninsula extension off of the one side. A yard off of another corner module was also discussed, but didn't get done due to the time factor.
The yard extension would be attached to the corner module where the ADM grain elevator is located in the second picture. The elevator spur would become the track to the yard.