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No matter if you have DCC or conventional DC, when you reverse the direction of the rails, you reverse polarity (DC) or phase (AC). You can use a [url="http://www.allelectronics.com/cgi-bin/item/STS-24/700525/DPDT_ON-OFF-ON_TOGGLE_SWITCH_.html"]double pole double throw switch[/url] if you have a good memory and attention span. Otherwise, life is much easier using an automatic reverser. MRC make them and you can find them at [url="http://www.ares-server.com/Ares/Ares.asp?MerchantID=RET01229&Action=Catalog&Type=Product&ID=82029"]Micro-Mark[/url] for around $30. Or you can use of the reversing circuit on your booster, if equiped, and it's not being used for a reverse loop, wye or other trackage that requires reversing track polarity.
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