Ok, so I'm figuring this out, but I have a question (or 3!). I'm using N scale Peco track, and after following David Popp's article (MR, Apr 2005), I started to solder these "jumper wires" on a section of track that I'm assembling. I'm also attaching feeder wires to every rail joint- it's overkill, but I'm an ex-Marine, and I LIKE overkill... anyway, it dawned on me. With every possible rail having a feeder wire to it, is it necessary to go with the jumpers, as well? (Me thinks no.) I know that I have to do some isolating of the rails, to prevent a short circuit- do I need only to isolate the inside rails past the frog? And if so, should they be isolated before, or after the rail joiner? (I'm thinking before) The layout, btw, will eventually be DCC, but right now, I'm only going to wire it as one big block. When I get more dough and more locos, I'll get a DCC system, but I'd like the layout to be plug-n-play capapble. Thanks for your help!