Amtrak crash: What investigators can learn from black boxes

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)WASHINGTON (AP) — Federal authorities will look at a variety of evidence as they try to pinpoint the cause of Tuesday night’s derailment in Philadelphia of Amtrak Train 188, which killed at least six people and injured 200. A former head of railroad accident investigations at the National Transportation Safety Board, Bob Chipkevich, says they’ll focus on several things:

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