What happened inside the Metro tunnel?

Name: What happened inside the Metro tunnel?
Uploaded: 2015-01-15T00:30:48+00:00
Duration: 76 s
Description: The National Transportation Safety Board said Tuesday the smoke in the Metro tunnel near L'Enfant Plaza was caused by electrical arcing, which occurs when electricity escapes its prescribed path. Here's how that happens.

22 просмотров 15.01.2015 00:01:16

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The National Transportation Safety Board said Tuesday the smoke in the Metro tunnel near L'Enfant Plaza was caused by electrical arcing, which occurs when electricity escapes its prescribed path. Here's how that happens.

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What happened inside the Metro tunnel?

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