What we know right now about the deadly Amtrak derailment

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PHILADELPHIA (AP) -- Nearly two weeks after a deadly Amtrak derailment in Philadelphia killed 8 people and injured more than 200 others, investigators are still trying to piece together what led the train to enter a sharp curve at more than double the 50 mph speed limit.

The National Transportation Safety Board has ruled out the locomotive being hit by a bullet and is now focused on whether the engineer was using his cellphone while operating it.

Funerals have been held. Lawsuits have been filed. And all but a few of the most seriously injured remain hospitalized. Here are a few key questions and what we know right now:

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What we know right now about the deadly Amtrak 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)
As Philadelphia Fire Commissioner Derrick Sawyer, right, Amtrak CEO Joeseph Boardman, second right, Pennsylvania Gov. Tom Wolf, second front left, listen as Mayor Michael Nutter, right at podium, announces that an eighth body has been found and all believed to be aboard a deadly train derailment have been accounted for , Thursday, May 14, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and crashed in Philadelphia on Tuesday night killing eight people and and sending more than 200 passengers and crew to area hospitals. Investigators have said the Amtrak passenger train was going more than twice the allowed speed when it shot off a sharp curve. (AP Photo/Mel Evans)
Investigators, center back, stand on the tracks near Tuesday's deadly train derailment, Thursday, May 14, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and crashed in Philadelphia on Tuesday night killing at least seven people and sending more than 200 passengers and crew to area hospitals. The engineer in this week's deadly train derailment doesn't remember the crash, his lawyer said Thursday, complicating the investigation into why the Amtrak passenger train was going more than twice the allowed speed when it shot off a sharp curve. (AP Photo/Mel Evans)
A flat bed truck hauls a section of new railroad track to the site of Tuesday's deadly train derailment, Thursday, May 14, 2015, in Philadelphia. At least seven people are dead and more than 200 people aboard injured, when the New York City bound Amtrak train derailed. Federal investigators have determined that the train was barreling through the city at 106 mph before it ran off the rails along a sharp curve where the speed limit drops to just 50 mph. (AP Photo/Mel Evans)
National Transportation Safety Board member Robert Sumwalt speaks during a news conference Thursday, May 14, 2015, in Philadelphia. Sumwalt said the Amtrak train that derailed Tuesday in Philadelphia sped up for a full minute before it derailed at a sharp curve, killing eight people and injuring more than 200. (AP Photo/Mel Evans)
Graphic shows an annotated aerial image of the site of the crash including derailment area and placement of train cars after the crash.; 4c x 3 inches; 195.7 mm x 76 mm;
National Transportation Safety Board member Robert Sumwalt speaks during a news conference Thursday, May 14, 2015, in Philadelphia. Sumwalt said the Amtrak train that derailed Tuesday in Philadelphia sped up for a full minute before it derailed at a sharp curve, killing eight people and injuring more than 200. (AP Photo/Mel Evans)
Pennsylvania Gov. Tom Wolf, center left, and Mayor Michael Nutter, center right, walk with others after visiting the investigation at the scene of Tuesday's deadly train derailment Thursday, May 14, 2015, in Philadelphia. Nutter announced that an eighth body has been found and all believed to be aboard a deadly train derailment have been accounted for. An Amtrak train headed to New York City derailed and crashed in Philadelphia on Tuesday night killing eight people and and sending more than 200 passengers and crew to area hospitals. Investigators have said the Amtrak passenger train was going more than twice the allowed speed when it shot off a sharp curve. (AP Photo/Mel Evans)
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)
As Philadelphia Mayor Michael Nutter, center left, listens Pennsylvania Gov. Tom Wolf addresses a gathering near the site of Tuesday's deadly train derailment Thursday, May 14, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and crashed in Philadelphia on Tuesday night killing eight people and and sending more than 200 passengers and crew to area hospitals. Investigators have said the Amtrak passenger train was going more than twice the allowed speed when it shot off a sharp curve. (AP Photo/Mel Evans)
As Philadelphia Mayor Michael Nutter, left, listens Amtrak CEO, Joseph Boardman discusses Tuesday's deadly train derailment Thursday, May 14, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and crashed in Philadelphia on Tuesday night killing eight people and and sending more than 200 passengers and crew to area hospitals. Investigators have said the Amtrak passenger train was going more than twice the allowed speed when it shot off a sharp curve. (AP Photo/Mel Evans)
Investigators, center back, stand on the tracks near Tuesday's deadly train derailment, Thursday, May 14, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and crashed in Philadelphia on Tuesday night killing at least seven people and sending more than 200 passengers and crew to area hospitals. The engineer in the deadly train derailment doesn't remember the crash, his lawyer said Thursday, complicating the investigation into why the Amtrak passenger train was going more than twice the allowed speed when it shot off a sharp curve. (AP Photo/Mel Evans)
A crane lifts a section of new railroad track from a flat bed track at the site of Tuesday's deadly train derailment, Thursday, May 14, 2015, in Philadelphia. At least seven people are dead and more than 200 people aboard injured, when the New York City bound Amtrak train derailed. Federal investigators have determined that the train was barreling through the city at 106 mph before it ran off the rails along a sharp curve where the speed limit drops to just 50 mph. (AP Photo/Mel Evans)
Philadelphia Mayor Michael Nutter, center right, hugs Lori Dee Patterson, a nearby resident, after she handed him a cup of coffee after he spoke at a news conference near the scene of a deadly train derailment, Wednesday, May 13, 2015, in Philadelphia. An Amtrak train headed to New York City derailed and crashed in Philadelphia on Tuesday night, killing at least six people and injuring dozens more. (AP Photo/Matt Slocum)
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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WAS THE ENGINEER USING HIS CELLPHONE AT THE CONTROLS?

That's what the NTSB is trying to find out.

The agency says investigators are comparing time stamps from engineer Brandon Bostian's phone records with locomotive data, radio transmissions and surveillance video to see whether the phone was used while the train was in motion.

Phone records show the phone was used to make calls, sent text messages and access data the day of the derailment, but it's unclear when. Bostian's lawyer says the phone was switched off and kept in a bag and he used it afterward only to dial 911.

Engineers aren't allowed to use phones while operating trains or preparing them for movement.

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WHAT WAS THE ENGINEER'S DAY LIKE BEFORE THE CRASH?

The first leg of Bostian's shift on May 12 was particularly grueling, union officials say, with equipment-related delays on his train to Washington shortening his rest break.

A system displaying track signals on the dashboard failed, forcing Bostian to pay close attention while reducing speeds far below normal, according to Railroad Workers United.

The train reached Washington 26 minutes late, leaving Bostian about an hour to rest, eat and use the restroom before his trip back to New York on the train that eventually derailed.

Bostian told investigators he didn't feel fatigued or ill prior to the derailment, the NTSB says. His lawyer, Robert Goggin, says he had no health issues and wasn't taking any medication.

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DID THE ENGINEER KNOW THE ROUTE?

Yes. Bostian was an engineer on the Northeast Corridor for about three years and was assigned to the Washington-to-New York route for several weeks before the derailment, the NTSB said.

He worked a five-day-a-week schedule, making a daily roundtrip from New York to Washington, and had a "very good working knowledge" of the territory and various speed restrictions, NTSB board member Robert Sumwalt said.

As part of his training, experts say, he would have shadowed veteran engineers and been graded on his performance navigating curves and speed restrictions before being qualified to work the route alone.

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WHY ALL THIS FOCUS ON THE ENGINEER?

Bostian was alone at the controls as the train rapidly increased speed heading into a sharp curve, so his actions and recollection of the moments leading to the derailment are critical.

There's no explanation for why the train went from 70 mph about a minute before the crash to 106 mph a few seconds before it left the tracks.

Investigators say preliminary inspections found no problems with the track, the signals or the locomotive.

They've also ruled out a bullet causing a grapefruit-size fracture on the locomotive's windshield and say they're uncertain whether anything struck the train.

It's unclear whether Bostian manually accelerated, Sumwalt said, though a data recorder shows that he did engage a braking system seconds before the derailment.

Bostian, who was injured, told investigators May 15 he didn't remember anything after ringing the train's bell while passing through a commuter rail station about 3 miles from the crash site, the agency said.

That's different from what his lawyer told ABC News the day after the crash. Goggin said Bostian recalled that the train was "pulling into speed-restricted track" but did not remember activating the emergency brake, as depicted on video from inside the cab.

Goggin said his client voluntarily submitted to a blood test and wasn't under the influence of drugs or alcohol.

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WHAT ABOUT THE VICTIMS?

Funerals have been held for several victims, including Naval Academy midshipman Justin Zemser and educational technology executive Rachel Jacobs. Others are being planned.

The family of Italian wine and olive oil broker Giuseppe Piras says it's having trouble returning his body to his homeland, in part because his body was moved to a New Jersey funeral home from Philadelphia without permission.

Several people injured in the derailment remained hospitalized as of Friday.

The conductor and nine passengers have sued Amtrak over the crash, and Sen. Bill Nelson, D-Florida, has introduced legislation that would increase the limit on damages Amtrak could be forced to pay from $200 million to $500 million.

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