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A Metro-North Railroad train passes through the intersection that was the site of a fatal collision between an SUV and a commuter train in Valhalla, N.Y., Thursday, Feb. 5, 2015. An investigation into what caused a fiery crash that killed a motorist and five rail riders is focusing on how a mother of three described by friends as safety conscious ended up between two crossing gates in her SUV as a commuter train barreled toward her. (AP Photo/Seth Wenig) ( APTOPIX Train Car Collision )

This February 4, 2015 National Transportation Safety Board (NTSB) board member Robert Sumwalt(C-back to camera) and other members of the investigation team, view a damaged rail car and Jeep involved in the Metro North train accident in Valhalla, New York. Safety on one of America's busiest commuter rail services was under the spotlight Wednesday after a packed passenger train slammed into a jeep, killing six people north of Manhattan. It was the worst of three deadly crashes in less than two years on the Metro North line that carries around 280,000 passengers a day. The woman driver of a jeep, which became stranded on the tracks, and five rail passengers were killed in the February 3 rush-hour accident, which ripped up tracks and ignited a major explosion. Fifteen other people were injured, seven of them seriously, in what should have been a monotonous but totally safe journey home to the suburbs after a busy working day in America's largest city. AFP PHOTO / HANDOUT / NTSB == RESTRICTED TO EDITORIAL USE / MANDATORY CREDIT: "AFP PHOTO / HANDOUT / NTSB "/ NO MARKETING / NO ADVERTISING CAMPAIGNS / NO A LA CARTE SALES / DISTRIBUTED AS A SERVICE TO CLIENTS ==--/AFP/Getty Images ( 537438988 )

Workers use a torch to cut through a piece of rail that appeared to be lodged between two Metro-North train cars after a crash with a sport utility vehicle that occurred on February 4, 2015 in Valhalla, New York. The crash started a fire in the train cars that killed seven people, including the driver of the vehicle. (Photo by Andrew Burton/Getty Images) ( 462754112 )

Officials inspect a Metro-North train crash with a sport utility vehicle that occurred on February 4, 2015 in Valhalla, New York. The crash started a fire in the train cars that killed seven people, including the driver of the vehicle. (Photo by Andrew Burton/Getty Images) ( 462753748 )

Emergency personnel work to remove the wreckage of a deadly SUV and commuter train accident in Valhalla, N.Y., Wednesday, Feb. 4, 2015. A packed Metro-North Railroad train slammed into a SUV on the tracks and erupted into flames Tuesday night, killing some and injuring others, sending hundreds of passengers scrambling for safety, authorities said. (AP Photo/Jason DeCrow) ( Train Car Collision )

Emergency personnel work to remove the wreckage of a deadly commuter train accident in Valhalla, N.Y., Wednesday, Feb. 4, 2015. A packed Metro-North Railroad train slammed into a SUV on the tracks and erupted into flames Tuesday night, killing some and injuring others, sending hundreds of passengers scrambling for safety, authorities said. (AP Photo/Jason DeCrow) ( Train Car Collision )

Emergency personnel work to remove the wreckage of a deadly SUV and commuter train accident in Valhalla, N.Y., Wednesday, Feb. 4, 2015. A packed Metro-North Railroad train slammed into a SUV on the tracks and erupted into flames Tuesday night, killing some and injuring others, sending hundreds of passengers scrambling for safety, authorities said. (AP Photo/Jason DeCrow) ( APTOPIX Train Car Collision )

The sport utility vehicle that was hit by a Metro-North train is removed from the site of the accident on February 4, 2015 in Valhalla, New York. The crash started a fire in the train car that killed seven people, including the driver of the vehicle. (Photo by Andrew Burton/Getty Images) ( 462761868 )

Crews work to repair a section of rail damaged by a deadly SUV and commuter train accident in Valhalla, N.Y., Wednesday, Feb. 4, 2015. A packed Metro-North Railroad train slammed into a SUV on the tracks and erupted into flames Tuesday night, killing some and injuring others, sending passengers scrambling for safety, authorities said. (AP Photo/Jason DeCrow) ( Train Car Collision )

A Metro-North Railroad train passes through the intersection that was the site of a fatal collision between an SUV and a train in Valhalla, N.Y., Thursday, Feb. 5, 2015. An investigation into what caused a fiery crash that killed a motorist and several rail riders is focusing on how a mother of three described by friends as safety conscious ended up between two crossing gates in her SUV as a commuter train barreled toward her. (AP Photo/Seth Wenig) ( Train Car Collision )

A National Transportation Safety Board employee examines the intersection where an SUV was struck by a Metro-North Railroad train in Valhalla, N.Y., Thursday, Feb. 5, 2015. An investigation into what caused a fiery crash that killed a motorist and several rail riders is focusing on how a mother of three described by friends as safety conscious ended up between two crossing gates in her SUV as a commuter train barreled toward her. (AP Photo/Seth Wenig) ( Train Car Collision )

Firefighters work the scene of a collision between a Metro-North Railroad passenger train and a vehicle in Valhalla, N.Y., Tuesday, Feb. 3, 2015. (AP Photo/The Journal-News, Frank Becerra, Jr.) ( CORRECTION Train Car Collision )

First responders work at the scene of a train accident on February 3, 2015 in Valhalla, New York. A Metro-North commuter train carrying hundreds of passengers struck a vehicle at a railroad crossing killing at least six people and injuring many more. (Photo by Andrew Delaney/Getty Images) ( 462726510 )

First responders work at the scene of a train accident on February 3, 2015 in Valhalla, New York. A Metro-North commutor train carrying hundreds of passengers struck a vehicle at a railroad crossing killing at least six people and injuring many more. (Photo by Andrew Delaney/Getty Images) ( 462726494 )

A Metro-North Railroad passenger train smolders after hitting a vehicle in Valhalla, N.Y., Tuesday, Feb. 3, 2015. (AP Photo/The Journal News, Frank Becerra Jr) ( CORRECTION Train Car Collision )

First responders work at the scene of a train accident on February 3, 2015 in Valhalla, New York. A Metro-North commutor train carrying hundreds of passengers struck a vehicle at a railroad crossing killing at least six people and injuring many more. (Photo by Andrew Delaney/Getty Images) ( 462726518 )

A Metro-North Railroad passenger train smolders after hitting a vehicle in Valhalla, N.Y., Tuesday, Feb. 3, 2015. (AP Photo/The Journal News, Frank Becerra Jr) ( CORRECTION Train Car Collision )

First responders work at the scene of a train accident on February 3, 2015 in Valhalla, New York. A Metro-North commuter train carrying hundreds of passengers struck a vehicle at a railroad crossing killing at least six people and injuring many more. (Photo by Andrew Delaney/Getty Images) ( 462726514 )

Emergency personnel work at the scene of a Metro-North Railroad passenger train and a vehicle accident in Valhalla, N.Y., Tuesday, Feb. 3, 2015. Metro-North Railroad spokesman Aaron Donovan says the train struck a vehicle at a railroad crossing about 20 miles north of New York City. (AP Photo/Robert Mecea) ( Train Car Collision )

Emergency personnel work at the scene of a Metro-North Railroad passenger train and vehicle accident in Valhalla, N.Y., Tuesday, Feb. 3, 2015. Metro-North Railroad spokesman Aaron Donovan says the train struck a vehicle at a railroad crossing about 20 miles north of New York City. (AP Photo/Robert Mecea) ( Train Car Crash )

Emergency personnel gather at the site of a collision between a train and vehicle in Valhalla, N.Y., Tuesday, Feb. 3, 2015. A packed commuter train slammed into a sport utility vehicle stuck on the tracks and erupted into flames, authorities said. (AP Photo/Seth Wenig) ( Train Car Collision )

Police investigate a Metro-North train crash on February 3, 2015 in Valhalla, New York. A Metro-North commuter train carrying hundreds of passengers struck a vehicle at a railroad crossing killing at least seven people and injuring many more. (Photo by Michael Graae/Getty Images) ( 462729396 )

Passengers are assisted off a Metro-North Railroad passenger train in Valhalla, N.Y., Tuesday, Feb. 3, 2015. Metro-North Railroad spokesman Aaron Donovan says the train struck a vehicle at a railroad crossing about 20 miles north of New York City. (AP Photo/The Journal News, Albert Conte) ( Train Car Collsion )

New York Gov. Andrew Cuomo arrives to the site of a collision between a train and vehicle in Valhalla, N.Y., Tuesday, Feb. 3, 2015. A packed commuter train slammed into a sport utility vehicle on the tracks and erupted into flames, authorities said. (AP Photo/Seth Wenig) ( Train Car Collision )

New York Governor Andrew Cuomo speaks to the media at the site of a Metro-North commuter train crash on February 3, 2015 in Valhalla, New York. A Metro-North commuter train carrying hundreds of passengers struck a vehicle at a railroad crossing killing at least seven people and injuring many more. (Photo by Michael Graae/Getty Images) ( 462729430 )

Metropolitan Transportation Authority (MTA) workers and police investigate a Metro-North train crash on February 3, 2015 in Valhalla, New York. A Metro-North commuter train carrying hundreds of passengers struck a vehicle at a railroad crossing killing at least seven people and injuring many more. (Photo by Michael Graae/Getty Images) ( 462729408 )

First responders work at the scene of a train accident on February 3, 2015 in Valhalla, New York. A Metro-North commuter train carrying hundreds of passengers struck a vehicle at a railroad crossing killing at least six people and injuring many more. (Photo by Andrew Delaney/Getty Images) ( 462726508 )

A firefighter walks past the burning wreckage of a Metro-North Railroad passenger train and a vehicle in Valhalla, N.Y., Tuesday, Feb. 3, 2015. (AP Photo/The Journal-News, Albert Conte) ( Train Car Collsion )

Emergency personnel work at the scene of a Metro-North Railroad passenger train and vehicle accident in Valhalla, N.Y., Tuesday, Feb. 3, 2015. A packed commuter train slammed into a sport utility vehicle stuck on the tracks and erupted into flames, authorities said. (AP Photo/Seth Wenig) ( Train Car Collision )

The wreckage of a car remains smashed against the front of a train in Valhalla, N.Y., Tuesday, Feb. 3, 2015. A packed commuter train slammed into a sport utility vehicle stuck on the tracks and erupted into flames Tuesday night, authorities said. (AP Photo/Seth Wenig) ( Train Car Collision )

Emergency personnel work at the scene of a Metro-North Railroad passenger train and vehicle accident in Valhalla, N.Y., Tuesday, Feb. 3, 2015. Metro-North Railroad spokesman Aaron Donovan says the train struck a vehicle at a railroad crossing about 20 miles north of New York City. (AP Photo/Robert Mecea) ( Train Car Crash )

Emergency personnel work at the scene of a Metro-North Railroad passenger train and vehicle accident in Valhalla, N.Y., Tuesday, Feb. 3, 2015. Metro-North Railroad spokesman Aaron Donovan says the train struck a vehicle at a railroad crossing about 20 miles north of New York City. (AP Photo/Robert Mecea) ( Train Car Collision )

Emergency personnel work at the scene of a Metro-North Railroad passenger train and vehicle accident in Valhalla, N.Y., Tuesday, Feb. 3, 2015. Metro-North Railroad spokesman Aaron Donovan says the train struck a vehicle at a railroad crossing about 20 miles north of New York City. (AP Photo/Robert Mecea) ( Train Car Crash )

Authorities wearing Federal Railroad Administration vests look over the wreckage of a Metro-North Railroad train and a SUV in Valhalla, N.Y., Wednesday, Feb. 4, 2015. Five train passengers and the SUVís driver were killed in Tuesday eveningís crash in Valhalla, about 20 miles north of New York City. Authorities said the impact was so forceful the electrified third rail came up and pierced the train. (AP Photo/Seth Wenig) ( Train Car Collision )

Emergency personnel work at the scene of a Metro-North Railroad passenger train and vehicle accident in Valhalla, N.Y., Tuesday, Feb. 3, 2015. A packed commuter train slammed into a sport utility vehicle stuck on the tracks and erupted into flames, authorities said. (AP Photo/Seth Wenig) ( Train Car Collision )

Firefighters work at the scene of an accident in Valhalla, N.Y., Tuesday, Feb. 3, 2015. A packed commuter train slammed into a sport utility vehicle on the tracks and the front of the train and the vehicle burst into flames, authorities said. (AP Photo/Kiley Armstrong) ( Train Car Collision )