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For which rail is positive:-
From the NMRA standards ( to which I think all manufacturers follow)
http://www.nmra.org/standards/sandrp/pdf/s-9.pdf
Direction control by polarity reversing shall be provided. Positive potential applied to the right hand rail shall
produce forward motion. (3)
(3) The term "right hand rail" as used herein means the rail to the right of the observer standing between the rails
with their back to the front of the locomotive.
From the NMRA standards ( to which I think all manufacturers follow)
http://www.nmra.org/standards/sandrp/pdf/s-9.pdf
Direction control by polarity reversing shall be provided. Positive potential applied to the right hand rail shall
produce forward motion. (3)
(3) The term "right hand rail" as used herein means the rail to the right of the observer standing between the rails
with their back to the front of the locomotive.
