@CNN: What is positive train control, and could it have prevented the Amtrak crash? https://t.co/BsttfwYrX6 https://t.co/PN0bmLaQrJ

December 19, 2017 / The Arbiter / CNN

@CNN: What is positive train control, and could it have prevented the Amtrak crash?
https://t.co/BsttfwYrX6 https://t.co/PN0bmLaQrJ

What is positive train control, and could it have prevented the Amtrak crash?
https://t.co/BsttfwYrX6 http://pic.twitter.com/PN0bmLaQrJ

— CNN (@CNN) December 19, 2017

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