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First responders fight burning trains after a train derailment and explosion in Lac-Megantic, Quebec early July 6, 2013, in this picture provided by the Transportation Safety Board of Canada. Picture taken July 6, 2013. REUTERS/Transportation Safety Board of Canada/Handout via Reuters ( CANADA-TRAIN/ )

The town burns following a train derailment and explosion in Lac Megantic, Quebec, early July 6, 2013. Picture taken July 6, 2013. REUTERS/Jean Gauthier ( CANADA-TRAIN/ )

The town continues to burn following a train derailment and explosion in Lac Megantic, Quebec, early July 6, 2013. The train was hauling about 50,000 barrels of crude from North Dakota's Bakken shale development to Irving Oil's 300,000 barrel per day (bpd) plant in Saint John, New Brunswick. REUTERS/Jean Gauthier ( CANADA-TRAIN/ )

The town burns following a train derailment and explosion in Lac Megantic, Quebec, early July 6, 2013. Picture taken July 6, 2013. REUTERS/Jean Gauthier ( CANADA-TRAIN/ )

The town continues to burn following a train derailment and explosion in Lac Megantic, Quebec, early July 6, 2013. REUTERS/Jean Gauthier ( CANADA-TRAIN/ )

A firefighter stands close to the remains of a train wreckage in Lac Megantic July 8, 2013. REUTERS/Mathieu Belanger ( CANADA-TRAIN/ )

Workers and firefighters work around the remains of downtown Lac Megantic July 8, 2013. REUTERS/Mathieu Belanger ( CANADA-TRAIN/ )

A aerial view of the wreckage of the crude oil train is seen in Lac Megantic, July 8, 2013. REUTERS/Mathieu Belanger ( CANADA-TRAIN/ )

A aerial view of the wreckage of the crude oil train is seen in Lac Megantic, July 8, 2013. REUTERS/Mathieu Belanger ( CANADA-TRAIN/ )

The remains of a burnt train are seen in Lac Megantic July 8, 2013. REUTERS/Mathieu Belanger ( CANADA-TRAIN/ )

The remains of a burnt train are seen in Lac Megantic, July 8, 2013. REUTERS/Mathieu Belanger ( CANADA-TRAIN/ )

Workers and firefighters work on the remains of downtown Lac Megantic, July 8, 2013. REUTERS/Mathieu Belanger ( CANADA-TRAIN/ )

The remains of a burnt train are seen in Lac Megantic, July 8, 2013. REUTERS/Mathieu Belanger ( CANADA-TRAIN/ )

Workers and firefighters work on the remains of downtown Lac Megantic, July 8, 2013. REUTERS/Mathieu Belanger ( CANADA-TRAIN/ )

Searchers dig through the rubble for victims of the inferno in Lac-Megantic, Quebec, Monday, July 8, 2013, after a train derailed igniting tanker cars carrying crude oil early Saturday. (AP Photo/THE CANADIAN PRESS, Ryan Remiorz) ( Canada Oil Train Derailment )

A burnt train car is seen after a train derailment and explosion in Lac-Megantic, Quebec July 8, 2013 in this picture provided by the Transportation Safety Board of Canada. REUTERS/Transportation Safety Board of Canada/Handout via Reuters ( ( CANADA-TRAIN/ )

An aerial view of burnt train cars after a train derailment and explosion in Lac-Megantic, Quebec July 8, 2013, in this picture provided by the Transportation Safety Board of Canada. REUTERS/Transportation Safety Board of Canada/Handout via Reuters ( CANADA-TRAIN/ )

A view of the town from a lookout point at Lac Megantic, Quebec, July 7, 2013. A driverless freight train carrying tankers of petroleum products derailed at high speed and exploded into a giant fireball in the middle of the small Canadian town of Lac-Megantic early on Saturday, destroying dozens of buildings and leaving an unknown number of people feared missing. REUTERS/Christinne Muschi ( CANADA-TRAIN/ )

Firefighters douse blazes after a freight train loaded with oil derailed in Lac-Megantic in Canada's Quebec province on July 6, 2013, sparking explosions that engulfed about 30 buildings in fire. At least 40 people are missing after a driverless oil tanker train derailed and exploded in the small Canadian town of Lac-Megantic, destroying dozens of buildings, a firefighter back from the scene told AFP. Franois Laplante-Delagrave/AFP/Getty Images ( 521191087 )

Firefighters douse blazes after a freight train loaded with oil derailed in Lac-Megantic in Canada's Quebec province on July 6, 2013, sparking explosions that engulfed about 30 buildings in fire. At least 40 people are missing after a driverless oil tanker train derailed and exploded in the small Canadian town of Lac-Megantic, destroying dozens of buildings, a firefighter back from the scene told AFP. Franois Laplante-Delagrave/AFP/Getty Images ( 521191083 )

Fire from a train explosion is seen in Lac Megantic, July 6, 2013. At least five people died and 40 were still missing on Sunday after the runaway train carrying crude oil exploded and destroyed the center of a small Canadian town in a disaster that raises fresh questions about shipping oil by rail. REUTERS/Stringer ( CANADA-TRAIN/ )

Firefighters walk past a burnt out vehicle near the train derailment in Lac Megantic, Quebec, July 7, 2013. A driverless freight train carrying tankers of petroleum products derailed at high speed and exploded into a giant fireball in the middle of the small Canadian town of Lac-Megantic early on Saturday, destroying dozens of buildings and leaving an unknown number of people feared missing. REUTERS/Christinne Muschi ( CANADA-TRAIN/ )

A woman cries as she leaves the Polyvalente Montignac, the school sheltering the people who were forced to leave their houses after the explosion, in Lac Megantic, July 7, 2013. Several people were missing after four tank cars of petroleum products exploded in the middle of a small town in the Canadian province of Quebec early on Saturday in a fiery blast that destroyed dozens of buildings. REUTERS/Mathieu Belanger ( CANADA-TRAIN/ )

A woman comforts her friend while they sit on the grass at the Polyvalente Montignac, the school sheltering the people who were forced to leave their houses after the explosion, in Lac Megantic, July 7, 2013. Several people were missing after four tank cars of petroleum products exploded in the middle of a small town in the Canadian province of Quebec early on Saturday in a fiery blast that destroyed dozens of buildings. REUTERS/Mathieu Belanger ( CANADA-TRAIN/ )

Melted siding on a home is seen near the scene of a train derailment in Lac Megantic, Quebec, July 7, 2013. A driverless freight train carrying tankers of petroleum products derailed at high speed and exploded into a giant fireball in the middle of the small Canadian town of Lac-Megantic early on Saturday, destroying dozens of buildings and leaving an unknown number of people feared missing.REUTERS/Christinne Muschi ( CANADA-TRAIN/ )

Firefighters work at the scene of a train derailment in Lac Megantic, Quebec, July 7, 2013. A driverless freight train carrying tankers of petroleum products derailed at high speed and exploded into a giant fireball in the middle of the small Canadian town of Lac-Megantic early on Saturday, destroying dozens of buildings and leaving an unknown number of people feared missing. REUTERS/Christinne Muschi ( CANADA-TRAIN/ )

The downtown core lays in ruins as fire fighters continue to water smoldering rubble Sunday, July 7, 2013 in Lac Megantic, Quebec. A runaway train derailed Saturday igniting tanker cars carrying crude oil. (AP Photo/THE CANADIAN PRESS,Ryan Remiorz) ( Canada Oil Train Derailment )

The downtown core lays in ruins as fire fighters continue to water smoldering rubble Sunday, July 7, 2013 in Lac Megantic, Quebec. A runaway train derailed Saturday igniting tanker cars carrying crude oil. ( Canada Oil Train Derailment )

Firefighters douse a blaze after a freight train loaded with oil derailed in Lac Megantic in Canada's Quebec province on July 6, 2013, sparking explosions that engulfed about 30 buildings in fire. At least one person has been killed and some 2,000 people forced from their homes. François Laplante-Delagrave/AFP/Getty Images ( 521188714 )

Canadian Prime Minister Setphen Harper answers questions on the train explosion in Quebec in Calgary, Alberta, July 6, 2013. REUTERS/Todd Korol ( CANADA-TRAINS/ )

The wreckage of a train is pictured after an explosion in Lac Megantic July 6, 2013. Several people were missing after four tank cars of petroleum products exploded in the middle of a small town in the Canadian province of Quebec early on Saturday in a fiery blast that destroyed dozens of buildings. REUTERS/Mathieu Belanger ( CANADA-TRAIN/ )

Federique Mailloux hugs a friend as they wait outside an emergency center for news of friends following a train derailment in downtown Lac Megantic, Quebec, that caused explosions of railway cars carrying crude oil on Saturday, July 6, 2013. (AP Photo/The Canadian Press, Paul Chiasson) ( Canada Oil Train Derailment )

Smoke rises from railway cars that were carrying crude oil after derailing in downtown Lac Megantic, Quebec, Canada, Saturday, July 6, 2013. The derailment sparked several explosions and forced the evacuation of up to 1,000 people. (AP Photo/The Canadian Press, Paul Chiasson) ( Canada Oil Train Derailment )

Smoke rises from railway cars that were carrying crude oil after derailing in downtown Lac Megantic, Quebec, Canada, Saturday, July 6, 2013. A large swath of Lac Megantic was destroyed Saturday after a train carrying crude oil derailed, sparking several explosions and forcing the evacuation of up to 1,000 people. (AP Photo/The Canadian Press, Paul Chiasson) ( Canada-Oil Train Derailment )

Smoke rises from railway cars that were carrying crude oil after derailing in downtown Lac Megantic, Quebec, Canada, Saturday, July 6, 2013. A large swath of Lac Megantic was destroyed Saturday after a train carrying crude oil derailed, sparking several explosions and forcing the evacuation of up to 1,000 people. (AP Photo/The Canadian Press, Paul Chiasson) ( Canada-Oil Train Derailment )

Smoke rises from railway cars that were carrying crude oil after derailing in downtown Lac Megantic, Que., Saturday, July 6, 2013. A large swath of Lac Megantic was destroyed Saturday after a train carrying crude oil derailed, sparking several explosions and forcing the evacuation of up to 1,000 people. (AP Photo/The Canadian Press, Paul Chiasson) ( Canada-Oil Train Derailment )

An aerial view of a fire in the town of Lac-Megantic is seen from a S˚retÈ du QuÈbec helicopter Saturday, July 6, 2014 following a train derailment the sparked several explosions in Lac Megantic, Quebec. (AP Photo/S˚retÈ du QuÈbec via The Canadian Press) ( Canada-Oil Train Derailment )

A firefighter walks past the remains of buildings after a train explosion at Lac Megantic, Quebec, July 6, 2013. REUTERS/Mathieu Belanger ( CANADA/ )