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› Philadelphia unveils new hybrid subway trains that use Prius-like regenerative braking to feed energy back into the grid
Philadelphia unveils new hybrid subway trains that use Prius-like regenerative braking to feed energy back into the grid
2014-04-16 16:00:17| Extremetech
A new battery-supercapacitor hybrid system will go online soon in Philadelphia, aimed at providing split-second power on-demand to the entire city and running the subway network at the same time.
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