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While answering one question, I remembered an old trick for preventing crossing wires while connecting feeder lines and laying track. It's just a simple audio continuity tester. You need a [url="http://www.allelectronics.com/cgi-bin/category.cgi?category=115&item=PZB-25&type=store"]piezo element[/url], a [url="http://www.allelectronics.com/cgi-bin/category.cgi?category=970&item=BST-71&type=store"]9 volt battery holder[/url], [url="http://www.allelectronics.com/cgi-bin/category.cgi?category=160600&item=PRC-1604&type=store"]9 volt battery[/url], a pair of [url="http://www.allelectronics.com/cgi-bin/category.cgi?category=search&item=ALG-17&type=store"]insulated alligator clips[/url] and some wire. Make a simple circuit by connecting one wire from the battery holder to the piezo element, the other wire from the battery holder to an alligator clip. Connect a wire to the other terminal of the piezo and a alligator clip on the other end. Connect the battery and test the circuit by touching the clips together. Now connect the clips to the bus wire or track terminals and/or rails. As you are laying track and feeder wires, If you connect the wrong wires or have a short from a reverse loop, the buzzer will sound. Having an alarm sound the instant you make a mistake is better than trying to find a short when your finished.
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