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[quote user="NWP SWP"]I have seen a few MTH HO scale three rail engines?! I have heard of three rail O but never HO! [/quote] Marklin is a German manufacturer that uses a three rail AC system. The third rail (studs in the center) carry the AC voltage, the outer rails are the returns and have the same polarity. With $120 million of annual sales it is the largest European model railroad manufacturer. Marklin was founded in 1858 and produced electric toy trains with AC voltage since about 1926. The MTH HO-scale three rail locomotives are for the Marklin System. It has nothing to do with advantages of a third rail, just a different system. I came to model railroading through Marklin. For me as a kid Marklin had the advantage that there are no polarity problems at loops and wyes as the outer rails have the same polarity. Regards, Volker
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