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TIME's The Brief TIMEnewsbrief

5 Technologies &Transportation Disasters

That system, known as positive train control, is being installed by several U.S. railroads after Congress signed a law in 2008 mandating its use after a devastating train collision in California killed over 20 passengers. http://goo.gl/10VJX9 More From The Brief: time.com/newsletter/the-brief #FullNewsAudioAvailable

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