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CHESTER, PA - APRIL 3:  Emergency personnel investigate the crash site of Amtrak Palmetto train 89 on April 3, 2016 in Chester, Pennsylvania.  Two people are confirmed dead after the lead engine of the train struck a backhoe that was on the track south of Philadelphia, according to published reports. Approximately 341 passengers and seven crew members were onboard the train, which was traveling from New York to Savannah, according to Amtrak.  (Photo by Mark Makela/Getty Images)
CHESTER, PA - APRIL 3:  Emergency personnel investigate the crash site of Amtrak Palmetto train 89 on April 3, 2016 in Chester, Pennsylvania.  Two people are confirmed dead after the lead engine of the train struck a backhoe that was on the track south of Philadelphia, according to published reports. Approximately 341 passengers and seven crew members were onboard the train, which was traveling from New York to Savannah, according to Amtrak.  (Photo by Mark Makela/Getty Images)

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An investigation is underway to determine how two Amtrak workers ended up on the wrong track, leading to a fatal crash. CNN's Sara Ganim has the details.