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What is "Field Shunting"?

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I don't know about the technical details of it, but it was a feature on pre-NTT trains to allow the motors to accelerate faster and reach a higher top speed. It was disabled after the Williamsburg Bridge crash in 1995 because it was believed that the faster trains might not be able to stop quickly enough at red signals. It's hard to know exactly how much faster the trains used to be, but I don't think it's that much in most cases. The NTTs are faster still, but they're capped at 55 MPH (and their motors shut off at 50), to prevent dangerous speeds.

 

A little-known fact about field shunting: the MTA has actually discussed its elimination as an energy-saving program, reducing the trains' electricity usage by 12 percent!

Edited by TheSubwayStation

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Technically, it is the term that describes the weakening of current flowing through a DC motor by adding a parallel circuit element. This makes the motor spin faster in order to restore the balance between the mag fields.

 

This topic has been beaten the crap out of. Try using the search function next time ;)

Edited by Fan Railer

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