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The NMRA standards say 12V minimum + 2V for DCC so new HO minimum is 14V.  There are voltage graphs for different scales showing min and max voltages buried in the DCC standards.  I'll find and post a link when get to my computer.  Another question that should be asked is would an increase in track voltage also cause a lighting function output voltage increase? Edit: Its S-9.1C  link here: <a href="http://www.nmra.org/sites/default/files/standards/sandrp/pdf/s-9.1_electrical_standards_2006.pdf">http://www.nmra.org/sites/default/files/standards/sandrp/pdf/s-9.1_electrical_standards_2006.pdf</a> It would seem that between 14V and 16V should be sufficient for HO scale.
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