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In the Pacific NW, there seems to be a lot more variables. I'm runing tests on my deck after experiencing acid soil, heavy rain and flooding; and slugs shorting out rails. Idea: You can use the cheapo Bachmann rail with good results, in a small area. Let them go ahead and rust, then scrub the top of the rail with an abrasive, followed by a light conductive paste. Looks really authentic, and operates well as long as wires are soldered inside/beneath the rails and you have piece-to-piece wires as well. For a little demo layout this is good looking. Unless you view this as a career, I don't recomment it for overall layout construction. Follow traditional 2-rail gapping (find plans similar to yours which include rail gaps. The biggest problem I've ever found on my own was a reverse loop disguised by distance. I had to take two colored pencils around the track diagram to solve it. If you take track polarity and switching constaints into your plans, you will almost automatically solve your concerns: eash "branch" is autonimously powered and can have multiple feeders along it. The bigger the wire, the better. Further, if you can get it in cable (surplus) form, you've got the ability to expand in an orderly fashion; rather than ripping wires out and cussing <grin.> BTW, my "garden Rway" varies between 200 (base) and about 2000 linear feet, depending on seasons. I'm ripping it all out, since we're moving; and I'm seriously considering weatherproof modules for indoor/outdoor use. This approach might address your concerns as well. -D
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