Harnessing the kinetic energy of subway trains
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Why not capture the kinetic energy of subway trains and use it to supplement the power the trains consume during startup.
The system would operate through a variation of regenerative braking. A flywheel attached to the rail system would harness the energy of trains as they slow for a station, converting it to electrical power. The harnessed power could then be used to give the train a boost to get moving again.