New York City Subway R142A 4 train at City Hall
1:21
Added: 3 years ago
From: FanRailer
Views: 4,268
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  • 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?

    PlasmaFire3000 2 years ago 3

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

    FanRailer 2 years ago

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