New York City Subway R142A 4 train at City Hall

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Uploaded by on Oct 28, 2008

Good View of the Difference between motor and trailer trucks. There was an outbound 6 train behind me, so that's what you are hearing in the background.

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Autos & Vehicles

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  • similar, but it is the inverters switching the frequency of the electrical current.

  • That whine is a beautiful sound...

    Is the reason why the motor pitch shifts after a few seconds of acceleration due to the drive system engaging a different set of windings to develop a constant amount of torque as the train gets up to speed?

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