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racrac, <br /> When I lived in N.central FL. I built a railroad in a un-airconditioned garage that saw a range of temps from 40-100 degrees. I didn't solder the joiners but I did solder a jumper wire shaped like a U across the joint. It allowed for expansion and contraction plus good flow of electricity. I think it came from John Olson's book on building the Jerome & Southwestern. If large changes in temps are not a concern I still wouldn't solder the joiners but would feed power to each section of track from a main pair of wires running under the entire line. I think the main pair of wires is called the bus line. Good luck.
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