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Injured passengers are removed from the scene of a train collision, Friday, May 17, 2013 in Fairfield, Conn. Two commuter trains serving New York City collided in Connecticut during Friday's evening rush hour, injuring about 50 people, authorities said. There were no reports of fatalities. (AP Photo/The Connecticut Post, Christian Abraham) ( Trains Collide-Conn )

A woman is transported to the hospital after two commuter trains collided in Bridgeport, Connecticut May 17, 2013. Some 20 to 25 people were injured on Friday when two trains collided on a commuter line near Fairfield, Connecticut, but there were no reports of fatalities, police and transit authorities said on Friday. The accident occurred when an eastbound train on the Metro North Railroad derailed and collided with a westbound train near Fairfield, said Metropolitan Transit Authority spokesman Aaron Donovan. REUTERS/ Michelle McLoughlin ( USA-TRAIN/ACCIDENT )

Emergency personnel and onlookers gather at the scene of a collision of two commuter trains in Bridgeport, Connecticut May 17, 2013. Some 20 to 25 people were injured on Friday when two trains collided on a commuter line near Fairfield, Connecticut, but there were no reports of fatalities, police and transit authorities said on Friday. The accident occurred when an eastbound train on the Metro North Railroad derailed and collided with a westbound train near Fairfield, said Metropolitan Transit Authority spokesman Aaron Donovan. REUTERS/ Michelle McLoughlin ( USA-TRAIN/ACCIDENT )

Emergency workers arrive at the scene of a train collision, Friday, May 17, 2013 in Fairfield, Conn. Two Metro North commuter trains serving New York City collided during Friday's evening rush hour, sending 60 people to the hospital, including five with critical injuries, Gov. Dannel Malloy said. (AP Photo/The Connecticut Post, Christian Abraham) ( APTOPIX Trains Collide-Conn )

Onlookers gather at the scene of a collision of two commuter trains in Bridgeport, Connecticut May 17, 2013. Some 20 to 25 people were injured on Friday when two trains collided on a commuter line near Fairfield, Connecticut, but there were no reports of fatalities, police and transit authorities said on Friday. The accident occurred when an eastbound train on the Metro North Railroad derailed and collided with a westbound train near Fairfield, said Metropolitan Transit Authority spokesman Aaron Donovan. REUTERS/ Michelle McLoughlin ( USA-TRAIN/ACCIDENT )

Metro-North Railroad employees work at the scene of the train derailment, Saturday, May 18, 2013 in Bridgeport, Conn. Officials described a devastating scene of shattered cars and other damage where two trains packed with rush-hour commuters collided in Connecticut, saying Saturday it's fortunate that no one was killed and that there weren't even more injuries. (AP Photo/The Connecticut Post, Christian Abraham) ( Trains Collide-Conn )

The scene of a Metro North train collision on May 18, 2013 in Fairfield, Connecticut. Two New Haven Line Metro North commuter trains collided on Friday, May 17 near Bridgeport, CT, injuring as many as 70 people. (Photo by Michael Graae/Getty Images) ( 168995802 )

Passengers wait to be picked up by bus after two commuter trains collided in Bridgeport, Connecticut, causing one to derail injuring numerous passengers, May 17, 2013. Some 20 to 25 people were injured on Friday in a train accident near Fairfield, Connecticut, a Fairfield Police spokesman said on Friday. REUTERS/ Michelle McLoughlin ( USA-TRAIN/ACCIDENT )

Passengers wait to be picked-up after two commuter trains collided in Bridgeport, Connecticut causing one to derail injuring numerous passengers, May 17, 2013. Some 20 to 25 people were injured on Friday in a train accident near Fairfield, Connecticut, a Fairfield Police spokesman said on Friday. REUTERS/ Michelle McLoughlin ( USA-TRAIN/ACCIDENT )

Onlookers gather at the scene of a collision of two commuter trains in Bridgeport, Connecticut May 17, 2013. Some 20 to 25 people were injured on Friday when two trains collided on a commuter line near Fairfield, Connecticut, but there were no reports of fatalities, police and transit authorities said on Friday. The accident occurred when an eastbound train on the Metro North Railroad derailed and collided with a westbound train near Fairfield, said Metropolitan Transit Authority spokesman Aaron Donovan. REUTERS/ Michelle McLoughlin ( USA-TRAIN/ACCIDENT )

Passengers wait to be picked up by bus after two commuter trains collided in Bridgeport, Connecticut, causing one to derail injuring numerous passengers, May 17, 2013. Some 20 to 25 people were injured on Friday in a train accident near Fairfield, Connecticut, a Fairfield Police spokesman said on Friday. REUTERS/ Michelle McLoughlin ( USA-TRAIN/ACCIDENT )

An onlooker looks at the Metro-North commuter trains involved in the train derailment, Saturday, May 18, 2013 in Bridgeport, Conn. Officials described a devastating scene of shattered cars and other damage where two trains packed with rush-hour commuters collided in Connecticut, saying Saturday it's fortunate that no one was killed and that there weren't even more injuries. (AP Photo/The Connecticut Post, Christian Abraham) ( Trains Collide-Conn )

A Connecticut state investigator examines the scene of a Metro North train collision on May 18, 2013 in Fairfield, Connecticut. Two New Haven Line Metro North commuter trains collided on Friday, May 17 near Bridgeport, CT, injuring as many as 70 people. (Photo by Michael Graae/Getty Images) ( 168995803 )

Metro-North Railroad President Howard Permut gets ready to descend a ladder after touring the scene of the train derailment, Saturday, May 18, 2013 in Bridgeport, Conn. Officials described a devastating scene of shattered cars and other damage where two trains packed with rush-hour commuters collided in Connecticut, saying Saturday it's fortunate that no one was killed and that there weren't even more injuries. (AP Photo/The Connecticut Post, Christian Abraham) ( Trains Collide-Conn )

Metro-North Railroad employees work at the scene of the train derailment, Saturday, May 18, 2013 in Bridgeport, Conn. Officials described a devastating scene of shattered cars and other damage where two trains packed with rush-hour commuters collided in Connecticut, saying Saturday it's fortunate that no one was killed and that there weren't even more injuries. (AP Photo/The Connecticut Post, Christian Abraham) ( Trains Collide-Conn )

NTSB investigators examine the scene of a Metro North train collision on May 18, 2013 in Fairfield, Connecticut. Two New Haven Line Metro North commuter trains collided on Friday, May 17 near Bridgeport, CT, injuring as many as 70 people. (Photo by Michael Graae/Getty Images) ( 168995801 )

Metro-North Railroad officials tour the scene of the train derailment, Saturday, May 18, 2013 in Bridgeport, Conn. Officials described a devastating scene of shattered cars and other damage where two trains packed with rush-hour commuters collided in Connecticut, saying Saturday it's fortunate that no one was killed and that there weren't even more injuries. (AP Photo/The Connecticut Post, Christian Abraham) ( Trains Collide-Conn )

NTSB member Earl Weener addresses the media at a press conference near the scene of Metro-North train collision, Saturdya, May 18, 2013 in Bridgeport, Conn. Also on the scene were Congressman Jim Himes, Senator Dick Blumenthal, Senator Chris Murphy and Gov. Dannel Malloy. Officials described a devastating scene of shattered cars and other damage where two trains packed with rush-hour commuters collided in Connecticut, saying Saturday it's fortunate that no one was killed and that there weren't even more injuries. (AP Photo/The Connecticut Post, Cathy Zuraw) ( Trains Collide-Conn )