By William C. Vantllono, June 2012
 
NS-999, Norfolk Southern's experimental 100% electric (all-battery) switcher, is undergoing an extensive rebuild with a new type of battery that, according to supplier Axion Power International, "is ideally suited for both electric and hybrid locomotive applications due to its high charge acceptance, fast charge and discharge capabilities – important in regenerative braking – and an inherent ability to equalize voltage when utilized in large string configurations."
 
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