Investigators uncertain anything hit train before derailment

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Amtrak Resumes NE Corridor Service; Crash Questions Remain


PHILADELPHIA (AP) — Federal authorities said they are uncertain if anything struck the windshield of an Amtrak train before it derailed in Philadelphia last week, but they have not ruled out the possibility.

Investigators, however, said they are certain a gunshot did not strike the train before the May 12 derailment, which killed eight people and injured more than 200 others.

FBI agents performed forensic work on a grapefruit-sized fracture on the left side of the Amtrak locomotive's windshield, and the National Transportation Safety Board said they found no evidence of any damage that could have been caused by a firearm.

Scenes from the crash site:

34 PHOTOS
Amtrak train crash, derailment, Philadelphia
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Investigators uncertain anything hit train before derailment
Amtrak assistant conductor Brandon Bostian stands by on Aug. 21, 2007 as Sandra Palmer of University City says goodbye to her boyfriend, Clyde Simpson, as he leaves for work in Chicago at the Amtrak station in St. Louis. Bostian was the engineer of the Amtrak train that derailed in Philadelphia. (Huy Richard Mach/St. Louis Post-Dispatch/TNS via Getty Images)
PHILADELPHIA, PA - MAY 13: Investigators and first responders work near the wreckage of an Amtrak passenger train carrying more than 200 passengers from Washington, DC to New York that derailed late last night May 13, 2015 in north Philadelphia, Pennsylvania. At least five people were killed and more than 50 others were injured in the crash. (Photo by Win McNamee/Getty Images)
PHILADELPHIA, PA - MAY 14: Members of the National Transportation Safety Board gather near the site of the Amtrak train derailment May 14, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after an Amtrak train derailed in Philadelphia on Tuesday night killing at least seven people and injured more than 200. (Photo by Mark Wilson/Getty Images)
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)
PHILADELPHIA, PA - MAY 13: Investigators and first responders work near the wreckage of Amtrak Northeast Regional Train 188, from Washington to New York, that derailed yesterday May 13, 2015 in north Philadelphia, Pennsylvania. At least six people were killed and more than 200 others were injured in the crash. (Photo by Win McNamee/Getty Images)
PHILADELPHIA, PA - MAY 13: In this handout image supplied by NTSB, NTSB member Robert Sumwalt works on the scene of the Amtrak Train #188 derailment on May 13, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after Amtrak train derailed in Philadelphia last night, killing at least seven people and injured more than 200. (Photo by NTSBgov via Getty Images)
National Transportation Safety Board lead investigator Robert Sumwalt speaks during a press conference regarding the wreckage of the derailed Amtrak Northeast Regional Train in Philadelphia, Pennsylvania, on May 13, 2015. The engineer of a US passenger train traveling at more than twice the approved limit slammed on the emergency brakes just before it derailed in Philadelphia, leaving at least seven people dead, investigators said. AFP PHOTO / ANDREW CABALLERO-REYNOLDS (Photo credit should read Andrew Caballero-Reynolds/AFP/Getty Images)
PHILADELPHIA, PA - MAY 13: Investigators and first responders work near the wreckage of Amtrak Northeast Regional Train 188, from Washington to New York, that derailed yesterday May 13, 2015 in north Philadelphia, Pennsylvania. At least six people were killed and more than 200 others were injured in the crash. (Photo by Win McNamee/Getty Images)
PHILADELPHIA, PA - MAY 13: Investigators and first responders work near the wreckage of an Amtrak passenger train carrying more than 200 passengers from Washington, DC to New York that derailed late last night May 13, 2015 in north Philadelphia, Pennsylvania. At least five people were killed and more than 50 others were injured in the crash. (Photo by Win McNamee/Getty Images)
Rescuers work around derailed carriages of an Amtrak train in Philadelphia, Pennsylvania, on May 13, 2015. Rescuers on May 13 combed through the mangled wreckage of a derailed train in Philadelphia after an accident that left at least six dead, as the difficult search for possible survivors continued. AFP PHOTO/JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
Rescuers stand near a derailed carriage of an Amtrak train in Philadelphia, Pennsylvania, on May 13, 2015. Rescuers on May 13 combed through the mangled wreckage of a derailed train in Philadelphia after an accident that left at least six dead, as the difficult search for possible survivors continued. AFP PHOTO/JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
Rescuers work around derailed carriages of an Amtrak train in Philadelphia, Pennsylvania, on May 13, 2015. Rescuers on May 13 combed through the mangled wreckage of a derailed train in Philadelphia after an accident that left at least six dead, as the difficult search for possible survivors continued. AFP PHOTO/JEWEL SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
Passengers queue infront of ticketing counters at Union Station on May 13, 2015 in Washington, DC. Rescuers on Wednesday combed through the mangled wreckage of a derailed train in Philadelphia after an accident that left at least six dead, as the difficult search for possible survivors continued. Witnesses said the front of Amtrak Train 188, heading from Washington DC to New York, shook as it went into a turn and crashed at about 9:30 pm on Tuesday (0130 GMT Wednesday). AFP PHOTO/MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
Information screen showing cancelled train services at the Union Station on May 13, 2015 in Washington, DC. Service has been interrupted after Amtrak train derailed in Philadelphia last night, killing at least six people and injured more than 140. (Photo by Alex Wong/Getty Images)
Injured Amtrak passengers that were bused from to New York from Philadelphia wait at Penn Station May 13, 2015 in New York. Rescuers on Wednesday combed through the mangled wreckage of a derailed train in Philadelphia after an accident that left at least six dead, as the difficult search for possible survivors continued. AFP PHOTO / TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Passengers injured in an Amtrak train derailment who were bused from to New York from Philadelphia, walk through Penn Station May 13, 2015 in New York. Rescuers on Wednesday combed through the mangled wreckage of a derailed train in Philadelphia after an accident that left at least six dead, as the difficult search for possible survivors continued. AFP PHOTO / TIMOTHY A. CLARY (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)
Carolan Berkeley (L), who had an Amtrak ticket to go from New York to Washington D.C., waits for a bus from New York to Washington D.C. on May 13, 2015 in New York City. An Amtrak train crash in Philadelphia last night has forced train service to be suspended between New York, Philadelphia and Washington D.C., causing commuters to use NJ Transit, flights and bus services. The crash killed at least six people and injured dozens more. (Photo by Andrew Burton/Getty Images)
My train crashed
http://t.co/GvooK8lq58
Im on @Amtrak train that just crashed. Im ok. Helping others. Pray for those injured.
@Amtrak @msnbc @NBCNews pray for these passengers. http://t.co/mksZNy7eqo
Amtrak Northeast Regional crashes, was en route to NYC http://t.co/Faz7G48nbf http://t.co/XoLgkdBnHY
#BREAKING - At least 50 hurt in Amtrak derailment in Philly. Live video here: http://t.co/btWPTtn6HM
Multiple injuries reported after Amtrak train #188 from DC to NYC derails in #Philadelphia. Several cars overturned. http://t.co/mHFbLOv3to
Lot's of injuries at the #amtrak derailment. #Pray http://t.co/DADBYAqojg
#Amtrak crash: 50+ people injured http://t.co/IpNb3bkIzp
Amtrak train derailment. http://t.co/fAwU7MFrZC
Live picture of the triage center at 2400 Wheatsheaf for the Amtrak derailment. http://t.co/JL2XuYZfob
EMT helping survivors taking them to the hospital #amtrak #philly http://t.co/SfyFJJjNqO
FBI: nothing indicates that #Amtrak derailment linked to terrorist attack http://t.co/P2as9zyu2S
Video I took moments after crash. People trying to open the door and get off the train. http://t.co/fJ2bxXfmhG
Photos from tonight's Amtrak derailment in Port Richmond http://t.co/DIv1xCk5YU http://t.co/ZzJqcOYPGU
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The developments came Monday as trains began running to New York again for the first time in nearly a week. They also raised new questions about the events leading up to the derailment, including a conversation an assistant conductor told investigators she heard between the Amtrak engineer and a regional rail train engineer minutes before the train sped up and went off the rails at a curve.

The assistant conductor said she heard the regional train engineer say he'd been "hit by a rock or shot at" and she thought she heard the Amtrak engineer say his train had also been struck.

The NTSB said the regional train engineer recalled no such conversation, and investigators listened to the dispatch tape and heard no communications from the Amtrak engineer to the railroad's dispatch center to say that something had struck the train.

The Southeastern Pennsylvania Transportation Authority said it doesn't know what caused the damage to its train that night.

Aftermath and cleanup of the wreckage:

21 PHOTOS
Amtrak accident aftermath
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Investigators uncertain anything hit train before derailment
PHILADELPHIA, PA - MAY 13: Police shut down a ramp that lead to a train track near the site of a train derailment accident May 13, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after Amtrak train derailed in Philadelphia last night, killing at least seven people and injured more than 200. (Photo by Alex Wong/Getty Images)
PHILADELPHIA, PA - MAY 15: A construction worker begins to unload heavy machinery from a truck to repair damaged train tracks at the crash site of this week's Amtrak passenger train on May 15, 2015 in Philadelphia, Pennsylvania. At least 8 people were killed and more than 200 others were injured in the train derailment carrying more than 200 passengers from Washington, DC to New York. (Photo by Mark Makela/Getty Images)
PHILADELPHIA, PA - MAY 15: NTSM spokesperson Robert Sumwalt is interviewed about the Amtrak crash near the wreckage of this week's Amtrak passenger train on May 15, 2015 in Philadelphia, Pennsylvania. At least eight people were killed and more than 50 others were injured in the train crash carrying more than 200 passengers from Washington, DC to New York, which derailed on May 12, 2015 in north Philadelphia. (Photo by Mark Makela/Getty Images)
PHILADELPHIA, PA - MAY 14: NTSB spokesmen Robert Sumwalt walks over to speak to the media about the Amtrak train derailment, May 14, 2015 in Philadelphia, Pennsylvania. Today rescue workers recovered another body from the wreckage after Tuesday night's Amtrak train derailment in Philadelphia, the death toll now at eight with more than 200 injured. (Photo by Mark Wilson/Getty Images)
PHILADELPHIA, PA - MAY 14: Joseph Boardman (L), President and CEO of Amtrak listens to Philadelphia Mayor Michael Nutter (L) speak about the Amtrak train derailment, May 14, 2015 in Philadelphia, Pennsylvania. Today rescue workers recovered another body from the wreckage after Tuesday night's Amtrak train derailment in Philadelphia, the death toll now at eight with more than 200 injured. (Photo by Mark Wilson/Getty Images)
PHILADELPHIA, PA - MAY 14: Investigators and rescue personnel gather near the site of the Amtrak train derailment May 14, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after an Amtrak train derailed in Philadelphia on Tuesday night, killing at least seven people and injured more than 200. (Photo by Mark Wilson/Getty Images)
PHILADELPHIA, PA - MAY 13: In this handout image supplied by NTSB, NTSB IIC Mike Flanigon (R) with Member Robert Sumwalt (L) and Vice Chairman Dinh-Zarr (Center-L) work on the scene of the Amtrak Train #188 derailment on May 13, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after Amtrak train derailed in Philadelphia last night, killing at least seven people and injured more than 200. (Photo by NTSBgov via Getty Images)
PHILADELPHIA, PA - MAY 13: Philadelphia Mayor Michael Nutter briefs members of the media near the site of a train derailment accident May 13, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after Amtrak train derailed in Philadelphia last night, killing at least seven people and injured more than 200. (Photo by Alex Wong/Getty Images)
PHILADELPHIA, PA - MAY 13: In this handout image supplied by NTSB, NTSB member Robert Sumwalt works on the scene of the Amtrak Train #188 derailment on May 13, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after Amtrak train derailed in Philadelphia last night, killing at least seven people and injured more than 200. (Photo by NTSBgov via Getty Images)
PHILADELPHIA, PA - MAY 13: In this handout image supplied by NTSB, The NTSB Go Team arrives on the scene of the Amtrak Train #188 Derailment on May 13, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after Amtrak train derailed in Philadelphia last night, killing at least seven people and injured more than 200. (Photo by NTSBgov via Getty Images)
PHILADELPHIA, PA - MAY 13: In this handout image supplied by NTSB, NTSB Recorder Specialist Cassandra Johnson (2nd R) works with officials on the scene of the Amtrak Train #188 derailment on May 13, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after Amtrak train derailed in Philadelphia last night, killing at least seven people and injured more than 200. (Photo by NTSBgov via Getty Images)
PHILADELPHIA, PA - MAY 13: In this handout image supplied by NTSB, NTSB IIC Mike Flanigon (L) briefs Vice Chairman Dinh-Zarr on the scene of the Amtrak Train #188 derailmenton May 13, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after Amtrak train derailed in Philadelphia last night, killing at least seven people and injured more than 200. (Photo by NTSBgov via Getty Images)
PHILADELPHIA, PA - MAY 13: In this handout image supplied by NTSB, NTSB member Robert Sumwalt with Philadelphia officials The NTSB Go Team arrives on the scene of the Amtrak Train #188 derailment on May 13, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after Amtrak train derailed in Philadelphia last night, killing at least seven people and injured more than 200. (Photo by NTSBgov via Getty Images)
PHILADELPHIA, PA - MAY 13: Philadelphia Mayor Michael Nutter briefs members of the media near the site of a train derailment accident May 13, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after Amtrak train derailed in Philadelphia last night, killing at least seven people and injured more than 200. (Photo by Alex Wong/Getty Images)
PHILADELPHIA, PA - MAY 14: NTSB spokesmen Robert Sumwalt briefs the media on the latest findings into Tueday's Amtrak train derailment, May 14, 2015 in Philadelphia, Pennsylvania. Today another body was found raising the death toll to eight with more than 200 injured. (Photo by Mark Wilson/Getty Images)
PHILADELPHIA, PA - MAY 14: Members of the National Transportation Safety Board gather near the site of the Amtrak train derailment May 14, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after an Amtrak train derailed in Philadelphia on Tuesday night, killing at least seven people and injured more than 200. (Photo by Mark Wilson/Getty Images)
PHILADELPHIA, PA - MAY 14: Police gather near the site of the Amtrak train derailment May 14, 2015 in Philadelphia, Pennsylvania. Service has been interrupted after an Amtrak train derailed in Philadelphia on Tuesday night killing at least seven people and injured more than 200. (Photo by Mark Wilson/Getty Images)
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)
PHILADELPHIA, PA - MAY 13: NTSB member Robert Sumwalt briefs members of the media near 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)
Maintance workers repair damaged lines after poles were knocked over when an Amtrak Northeast Regional Train derailed in Philadelphia, Pennsylvania, on May 13, 2015. US investigators on Wednesday painstakingly combed through the twisted wreckage of an Amtrak train for clues as to why it derailed in Philadelphia, leaving at least six people dead and more than 200 injured. Officials warned the death toll could rise after the crash late Tuesday along the busy northeast US rail corridor linking Washington and New York, as some of the 243 passengers and crew believed to have been on the train had not yet been accounted for. AFP PHOTO/ ANDREW CABALLERO-REYNOLDS (Photo credit should read Andrew Caballero-Reynolds/AFP/Getty Images)
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Investigators have focused on the acceleration of the Amtrak train as it approached the curve, reaching 106 mph as it entered a 50 mph stretch and slowing down only slightly before the crash.

Amtrak engineer Brandon Bostian has told authorities he doesn't recall anything in the few minutes before the derailment. He was among those injured.

The NTSB said Monday it could be a year before it determines the probable cause of the derailment.

Amtrak resumed service Monday with a 5:30 a.m. southbound train leaving New York City.

All Acela Express, Northeast Regional and other services also resumed service. Amtrak officials said Sunday that trains along the Northeast Corridor from Washington to Boston would return to service in "complete compliance" with federal safety orders.

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