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Caption:PHILADELPHIA, PA - MAY 13: Repair crews inspect damages at the site of a train derailment accident May 13, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after an Amtrak train derailed in Philadelphia last night, killing at least seven people and injured more than 200. (Photo by Alex Wong/Getty Images)
Caption:PHILADELPHIA, PA - MAY 13: Repair crews inspect damages at the site of a train derailment accident May 13, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after an Amtrak train derailed in Philadelphia last night, killing at least seven people and injured more than 200. (Photo by Alex Wong/Getty Images)

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Amtrak derailment probe focusing on engineer's actions

CNN's Rene Marsh has the latest on the investigation into the Amtrak train derailment in Philadelphia.

Amtrak derailment probe focusing on engineer's actions

CNN's Rene Marsh has the latest on the investigation into the Amtrak train derailment in Philadelphia.