Story highlights
Philadelphia's mayor calls the engineer's actions "reckless and irresponsible"
An NTSB official says the mayor's comments are "inflammatory"
The train's engineer has been identified to CNN as 32-year-old Brandon Bostian from New York
How do all seven cars and the engine of an Amtrak train jump the rails, sending passengers, luggage, laptops and more flying?
One possibility loomed over all others Wednesday: speed.
Authorities havenât said what caused the derailment of Amtrak Northeast Regional Train 188 in Philadelphia on Tuesday night, but Philadelphia Mayor Michael Nutter had harsh words for the trainâs engineer.
âClearly it was reckless in terms of the driving by the engineer. Thereâs no way in the world he should have been going that fast into the curve,â Nutter told CNNâs âThe Situation Room.â
Preliminary data show the trainâs speed exceeded 100 mph before the derailment. That would be more than twice the 50 mph speed limit for the curve it was in.
âI donât know what was going on with him (the engineer). I donât know what was going on in the cab, but thereâs really no excuse that can be offered, literally, unless he had a heart attack,â Nutter said.
NTSB board member Robert Sumwalt immediately slammed the mayorâs comments as inflammatory.
âYouâre not going to hear the NTSB making comments like that. We want to get the facts before we start making judgments,â Sumwalt said.

The engineer operating the train, identified to CNN as 32-year-old Brandon Bostian from New York, applied full emergency brakes âjust momentsâ before the train derailed, according to Sumwalt. The train was traveling about 106 mph as it headed into a left turn. The speed limit immediately before the curve was 80 mph.
An official with direct knowledge of the investigation earlier said that authorities were focusing on speed as a possible cause, given the angles of the wreckage and type of damage to the cars. The recorder, or âblack box,â discovered at the scene could be pivotal by showing just that, former NTSB official John Goglia said.
Peter Goelz, once a top NTSB figure and now a CNN analyst, predicted that a definitive conclusion could come soon.
âIâm afraid that this train might be going too fast for this turn,â he said.
Investigators looking at speed as factor
Sumwalt has said only that his team will examine things such as the condition of the track and the train, how the signals operated and âhuman performance.â
Even if itâs determined the train was going too fast, that could be because of the engineer or a mechanical issue, such as faulty brakes.
âYou have a lot of questions, we have a lot of questions,â Sumwalt told reporters. âWe intend to answer many of those questions in the next 24 to 48 hours.â
Midshipman, AP staffer among the 7 dead
Some 238 passengers and five crew members were on the train when it crashed around 9:30 p.m. Tuesday. Authorities said that at least seven people were killed.
One of those who died was Jim Gaines, a father of two who worked as a video software architect for The Associated Press, his company said.
His family asked for privacy, saying: âJim was more precious to us than we can adequately express.â
Another was a U.S. Naval Academy midshipman in full uniform heading home to New York on leave from the Annapolis, Maryland, school. A family member described 20-year-old Justin Zemser as a great person and genius whose death has left his parents âbeside themselves.â
Derrick Griffith, dean of student affairs for City University of New York Medgar Evers College, was also among the fatalities, according to Jamilah Fraser, a spokeswoman for the university. He lived in Brooklyn.
Hospitals have treated more than 200 others, many of whom have been released. That figure included eight in critical condition at Temple University Hospital â the closest trauma center to the crash site â according to Herb Cushing, the hospitalâs medical director.
Cushing said many passengers were injured when other passengers or objects fell on them. One of those hurt is the trainâs engineer, who received medical treatment and was interviewed by police, Mayor Nutter said.
Bostian, the engineer, initially told Philadelphia police he could not recall his speed, according to a law enforcement source with knowledge of the investigation.
Detectives have since tried to interview the engineer of the train further. They brought him in Wednesday, but he refused to be interviewed, and left with a lawyer, according to a police official.
Police are in the process of getting a search warrant for the engineerâs phone records so they can determine whether he was distracted at the time of the crash, the law enforcement official said.
Determining Bostianâs blood-alcohol level immediately after the crash would be a normal part of the investigation, according to Sumwalt. Regulations require Amtrak to take a blood sample.
âIt should have been done, and I have no reason to believe it was not done,â Sumwalt said.
According to Bostianâs LinkedIn profile, he has been an engineer for Amtrak since 2010, and was a conductor for four years before that. Prior to Amtrak, Bostian worked as a cashier at Target.
CNN spoke to a neighbor of the engineer near his home in Forest Hills, New York, who last saw him two weeks ago. Moresh Koya described Bostian as responsible and happy with his job.
Authorities have not ruled out the possibility of more victims at the crash site. Nutter noted that not everyone on Amtrakâs manifest has been accounted for. He didnât specify a number.
âWe are heartbroken by what weâve experienced here,â the mayor said early Wednesday. âWe have not experienced anything like this in modern times.â
Amtrak train crash victims tell their stories
âA lot of questionsâ
The miracle may be how some escaped relatively unscathed, given the severity of the derailment. A U.S. Department of Transportation representative told CNN that the engine and two cars were left standing upright, three cars were tipped on their sides, and one was nearly flipped over on its roof. The seventh one was âleaning hard.â
âIt is amazing,â Nutter said. âI saw some people last night literally walking off that train. I donât know how they did it.â
The Washington-New York corridor is the busiest stretch for Amtrak nationwide. Hundreds of trains, carrying thousands of passengers, have made that trip in recent years, most of them rolling seamlessly from start to finish on a roughly 3½-hour journey.
Thatâs what seemed to be happening Tuesday night, passenger Daniel Wetrin said.
âEverything was normal,â he said. âThen it was just chaos.â

Jeremy Wladis was in the very last car, eating, when he noticed the train starting to do âfunny things. And it gradually starts getting worse and worse.â
Things started flying â phones, laptops. âThen people.â
âThere were two people in the luggage rack above my head. Two women, catapulted (there).â
As she read a book in the second-to-last car, Janna DâAmbrisi said, she âfelt like we were going a little too fast around a curve. The car she was in started to tip, and she was thrown onto another woman.
âPeople started to fall on us,â she said. âI just held on to her leg and sort of bowed my head and I was kind of praying, âPlease make it stop.â â
Fortunately, DâAmbrisiâs train car didnât tip over and she made it out safely. She credited many people â including one fellow passenger who guided people with his shoes off â for stepping up.
âEveryone was just trying to help the people who were injured, who had blood coming out of their head, their noses, to help them sit down in the dirt away from the rails,â she said.
Former congressman on board tweets after the crash
âHeavily used stretch of trackâ
The locomotive was built by Siemens and delivered to Amtrak in 2014 specifically for its Northeast Corridor service, a Siemens official said. That makes it fairly new, which doesnât rule out the trainâs condition playing a role in the crash but seemingly makes it less likely.
The stretch of track where the train derailed was not equipped with an automated speed control system called positive train control, NTSB board member Sumwalt said.
He told reporters: âWe feel that had such a system been installed in this section of track, this accident would not have occurred.â
Another factor that canât be discounted is where the crash happened.
âItâs an extremely heavily used stretch of track,â transportation analyst Matthew L. Wald said of the area. âThey have trouble keeping it in a state of good repair.â
The crash threw northeast travel into turmoil Wednesday, as a delay on the line where the train derailed is a major disruption for the region. Passengers scrambled to make other arrangements with buses and commercial airlines picking up some of the slack.
The derailment was Amtrakâs ninth this year, according to the Federal Railroad Administration, and while its cause has not yet been determined, some, like Wald, are already discussing the nationâs aging rail infrastructure.
Noting President Barack Obamaâs commitment to upgrading the countryâs infrastructure, White House press secretary Josh Earnest said the Obama administration is âhard at workâ trying to figure out what caused the crash, and that their thoughts and prayers are with the families of everyone affected.
âAlong the Northeast Corridor, Amtrak is a way of life for many,â the President said later in a statement. âFrom Washington, D.C., and Philadelphia to New York City and Boston, this is a tragedy that touches us all.â
Amtrak train derails in Philadelphia
CNNâs Dana Ford, David Shortell, AnneClaire Stapleton, Jason Hanna, Saeed Ahmed, Sara Sidner, Rene Marsh, Catherine E. Shoichet, Tony Marco, Janet DiGiacomo, Sam Stringer and Holly Yan contributed to this report.