Train vibrations translate into safe crossings

04/2/2013 | Business Insider

A mechanical motion rectifier turns the vibrations from approaching trains at railroad crossings into useful motion that can power DC motors to operate railroad signs and gates. The device was developed by Lei Zuo, a Stony Brook University mechanical engineering professor. "Other people's work on this has used materials that are very expensive and inefficient at converting energy. You could harvest small-scale energy to power sensors, but not enough to power lights," Zuo said.

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