One hundred and forty thousand miles of track are used to carry freight across the U.S. The trains and track are largely operated by private companies, which are facing increased scrutiny after three recent derailments. In the last decade the industry has had between 10 and 20 train derailments every year, involving hazardous materials. Correspondent Dan Lieberman is in Pittsburgh to talk to safety advocates, rail workers, and residents to find out what it will take to keep our rail lines safe.

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