What polarity do DC trains work on

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S

skyler

New Member
I have a DC train that I just repaired, but I don't know what polarity I should operate at. When the train is moving forward, should the positive lead be at the left or right wheel for standard DC HO trains?
 
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NMRA S-9 states:

A. Direction control by polarity reversing shall be provided. Positive potential applied to the right hand rail shall produce forward motion. (3)
 
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