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DC by Foot: Metro train leaves the station

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Uploaded by on May 20, 2007

A DC subway train leaving the Friendship Heights Metro station. Washington, DC.

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Travel & Events

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Standard YouTube License

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  • The Rohrs are my favorite cars. Nice video.

  • i believe the sounds come from devices called GTO thyristors, which feed pulses (the gear changing sounds) of current to the traction motors.

    according to wikipedia: "the noise is produced by the oxygen in the air vibrating as the magnetic field changes (oxygen is magnetic whereas nitrogen is not)."

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