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.
Subway trains use a significant amount of energy to get going, up to 4 megawatts, writes Timon Singh:
"That's enough energy to power 1,300 average U.S. homes. The power usage is so great that train departures are staggered in order to accomdate the availability of power."
Vykon, the company developing the flywheels, thinks it can generate up to 4 megawatts from the subway's kinetic energy and send it back into the system.

Planetizen Federal Action Tracker
A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

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The seventh year of the city's Vision Zero strategy also cut the number of people killed in alcohol-related crashes by half.

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Reports show that the data tenant screening companies use is often riddled with errors and relies on information that has no bearing on whether someone will be a good tenant.
Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
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Smith Gee Studio
City of Camden Redevelopment Agency
City of Astoria
Transportation Research & Education Center (TREC) at Portland State University
City of Camden Redevelopment Agency
Municipality of Princeton (NJ)