Like systems used in electric vehicles like the Prius, an energy company think it could attach flywheels to subway trains and use the kinetic energy of their movement to generate energy that would feed back into the system.
Sep 11, 2011 Inhabitat
A New Jersey Burger King will soon be a test site for motion energy-generation technology. Drive-thru patrons will depress panels, creating kinetic energy which can be turned into electricity.
Jul 9, 2009 autobloggreen.com