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[quote user="carknocker1"] It isElectrical contact in  the areas near the crossing , there is a small electric current in the rail . this area is isolated with insolators in the rail and when the wheels cross into this section of track the signals will go off . You can test this yourself by hooking jumper cables between the rails , but for several legal reasons I would not recommend it .[/quote]Yeah, that might be a rather bad idea![8D]
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