I finished up my last shelves. The bus wires were #12 stranded, and were about 60 feet long from the command station to the end of the shelves. Well, the quarter trick didn't work. The command station would not shut down when the rails were shorted. Darn it, I guess that means another $150 for a booster for this section of shelves. Instead, I got some #6 copper wire and used that to feed the shelves. Presto, it all works fine now. However, I am a bit concerned about the length, I read somewhere that long runs can cause problems from induction and perhaps the "antenna" effect? Capacitance? But so far, so good.