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New York City firefighters use an emergency staircase to evacuate passengers from a derailed F train on May 2, 2014 in the Woodside neighborhood of the Queens borough of New York City. According to the Metropolitan Transportation Authority (MTA) the express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet from the 65th station in Woodside, Queens with hundreds of passengers on board. (Photo by Spencer Platt/Getty Images) ( 487825627 )

An injured man is aided by New York City firefighters after being evacuated from an emergency staircase following an F train derailment on May 2, 2014 in the Woodside neighborhood of the Queens borough in New York City. According to the Metropolitan Transportation Authority (MTA) the express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet from the 65th station in Woodside, Queens with hundreds of passengers on board. (Photo by Spencer Platt/Getty Images) ( 487825527 )

New York City firefighters, police and rescue workers use an emergency staircase to evacuate passengers from a derailed F train on May 2, 2014 in the Woodside neighborhood of the Queens borough of New York City. According to the Metropolitan Transportation Authority (MTA) the express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet from the 65th station in Woodside, Queens with hundreds of passengers on board. (Photo by Spencer Platt/Getty Images) ( 487825611 )

A woman is aided by New York City firefighters after being evacuated from an emergency staircase following an F train derailment on May 2, 2014 in the Woodside neighborhood of the Queens borough in New York City. According to the Metropolitan Transportation Authority (MTA) the express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet from the 65th station in Woodside, Queens with hundreds of passengers on board. (Photo by Spencer Platt/Getty Images) ( 487825577 )

An injured man is aided by New York City firefighters after being evacuated from an emergency staircase following an F train derailment on May 2, 2014 in the Woodside neighborhood of the Queens borough in New York City. According to the Metropolitan Transportation Authority (MTA) the express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet from the 65th station in Woodside, Queens with hundreds of passengers on board. (Photo by Spencer Platt/Getty Images) ( 487825575 )

A woman is aided by New York City firefighters after being evacuated from an emergency staircase following an F train derailment on May 2, 2014 in the Woodside neighborhood of the Queens borough in New York City. According to the Metropolitan Transportation Authority (MTA) the express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet from the 65th station in Woodside, Queens with hundreds of passengers on board. (Photo by Spencer Platt/Getty Images) ( 487825595 )

New York City firefighters use an emergency staircase to evacuate passengers from a derailed F train on May 2, 2014 in the Woodside neighborhood of the Queens borough of New York City. According to the Metropolitan Transportation Authority (MTA) the express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet from the 65th station in Woodside, Queens with hundreds of passengers on board. (Photo by Spencer Platt/Getty Images) ( 487825567 )

New York City firefighters use an emergency staircase to evacuate passengers from a derailed F train on May 2, 2014 in the Woodside neighborhood of the Queens borough of New York City. According to the Metropolitan Transportation Authority (MTA) the express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet from the 65th station in Woodside, Queens with hundreds of passengers on board. (Photo by Spencer Platt/Getty Images) ( 487825545 )

New York City firefighters use an emergency staircase to evacuate passengers from a derailed F train on May 2, 2014 in the Woodside neighborhood of the Queens borough of New York City. According to the Metropolitan Transportation Authority (MTA) the express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet from the 65th station in Woodside, Queens with hundreds of passengers on board. (Photo by Spencer Platt/Getty Images) ( 487825597 )

New York City firefighters and rescue workers use an emergency staircase to evacuate passengers from a derailed F train on May 2, 2014 in the Woodside neighborhood of the Queens borough of New York City. According to the Metropolitan Transportation Authority (MTA) the express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet from the 65th station in Woodside, Queens with hundreds of passengers on board. (Photo by Spencer Platt/Getty Images) ( 487825565 )

New York City firefighters, police and rescue workers use an emergency staircase to evacuate passengers from a derailed F train on May 2, 2014 in the Woodside neighborhood of the Queens borough of New York City. According to the Metropolitan Transportation Authority (MTA) the express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet from the 65th station in Woodside, Queens with hundreds of passengers on board. (Photo by Spencer Platt/Getty Images) ( 487825609 )

New York City firefighters, police and rescue workers use an emergency staircase to evacuate passengers from a derailed F train on May 2, 2014 in the Woodside neighborhood of the Queens borough of New York City. According to the Metropolitan Transportation Authority (MTA) the express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet from the 65th station in Woodside, Queens with hundreds of passengers on board. (Photo by Spencer Platt/Getty Images) ( 487825571 )

New York City fire department emergency medical personnel assist a woman who was evacuated from a subway train after it derailed in the Queens borough of New York, Friday, May 2, 2014. The express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet (365 meters) south of the 65th Street station, according to the Metropolitan Transportation Authority. Dozens of firefighters and paramedics with stretchers converged on Broadway and 60th Street, where passengers calmly left the tunnel through the sidewalk opening. A few were treated on stretchers. (AP Photo/Julie Jacobson) ( Subway Derailment )

A New York City police officer directs passengers as they are evacuated from a subway tunnel after a train derailed in the Queens borough of New York, Friday, May 2, 2014. The express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet (365 meters) south of the 65th Street station, according to the Metropolitan Transportation Authority. Dozens of firefighters and paramedics with stretchers converged on Broadway and 60th Street, where passengers calmly left the tunnel through the sidewalk opening. A few were treated on stretchers. (AP Photo/Julie Jacobson) ( Subway Derailment )

A New York City fire department EMT assists a woman who was evacuated from a subway train after it derailed in the Queens borough of New York, Friday, May 2, 2014. The express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet (365 meters) south of the 65th Street station, according to the Metropolitan Transportation Authority. Dozens of firefighters and paramedics with stretchers converged on Broadway and 60th Street, where passengers calmly left the tunnel through the sidewalk opening. A few were treated on stretchers. (AP Photo/Julie Jacobson) ( Subway Derailment )

Residents of an apartment building at 60th Street and Broadway in Queens borough of New York, watch as emergency crews evacuate passengers from a subway tunnel after a train derailed, Friday, May 2, 2014. The express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. Dozens of firefighters and paramedics with stretchers converged on Broadway and 60th Street, where passengers calmly left the tunnel through the sidewalk opening. A few were treated on stretchers. (AP Photo/Julie Jacobson) ( Subway Derailment )

New York City firefighters emerge from a hatch in the sidewalk at 60th Street and Broadway after evacuating passengers from a subway train that derailed in the Queens borough of New York, Friday, May 2, 2014. The express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet (365 meters) south of the 65th Street station, according to the Metropolitan Transportation Authority. Dozens of firefighters and paramedics with stretchers converged on Broadway and 60th Street, where passengers calmly left the tunnel through the sidewalk opening. A few were treated on stretchers. (AP Photo/Julie Jacobson) ( Subway Derailment )

New York City emergency crews converge at 60th Street and Broadway to evacuate passengers from a subway train after it derailed in the Queens borough of New York, Friday, May 2, 2014. The express F train was bound for Manhattan and Brooklyn when it derailed at 10:40 a.m. about 1,200 feet (365 meters) south of the 65th Street station, according to the Metropolitan Transportation Authority. Dozens of firefighters and paramedics with stretchers converged on Broadway and 60th Street, where passengers calmly left the tunnel through the sidewalk opening. A few were treated on stretchers. (AP Photo/Julie Jacobson) ( Subway Derailment )