Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds.

Emergency personnel gather near the scene of a deadly train wreck, Wednesday, May 13, 2015, after a fatal Amtrak derailment Tuesday night, in the Port Richmond section of Philadelphia. Federal investigators arrived Wednesday to determine why an Amtrak train jumped the tracks in a wreck that killed at least six people, and injured dozens. (AP Photo/Mel Evans)
Emergency personnel gather near the scene of a deadly train wreck, Wednesday, May 13, 2015, after a fatal Amtrak derailment Tuesday night, in the Port Richmond section of Philadelphia. Federal investigators arrived Wednesday to determine why an Amtrak train jumped the tracks in a wreck that killed at least six people, and injured dozens. (AP Photo/Mel Evans)

    JUST WATCHED

    How often do train engineers break speed rules?

MUST WATCH

How often do train engineers break speed rules?

Railroad Accident Forensics Expert Robert Halstead and former NTSB vice chairman Bob Francis discuss factors behind the fatal Amtrak derailment.

How often do train engineers break speed rules?

Railroad Accident Forensics Expert Robert Halstead and former NTSB vice chairman Bob Francis discuss factors behind the fatal Amtrak derailment.