Flames shoot into the air while venting from a propane tank during the Blue Cut fire in San Bernardino County, California, U.S. August 17, 2016. REUTERS/Patrick T Fallon 

Terralyn Lehman recalls fleeing the Erskine Fire as she sits outside an evacuation center at Kernville Elementary School in Kernville, California, U.S. June 26, 2016. Lehman, whose South Lake home burned Thursday, said the sound of an exploding propane tank woke her and her mom as the flames reached their back fence. REUTERS/Noah Berger 

Terralyn Lehman recalls fleeing the Erskine Fire as she sits outside an evacuation center at Kernville Elementary School in Kernville, California, U.S. June 26, 2016. Lehman, whose South Lake home burned Thursday, said the sound of an exploding propane tank woke her and her mom as the flames reached their back fence. REUTERS/Noah Berger 

Terralyn Lehman recalls fleeing the Erskine Fire as she sits outside an evacuation center at Kernville Elementary School in Kernville, California, U.S. June 26, 2016. Lehman, whose South Lake home burned Thursday, said the sound of an exploding propane tank woke her and her mom as the flames reached their back fence. REUTERS/Noah Berger TPX IMAGES OF THE DAY

Several pallets of propane gas tanks are seen ready for loading at Strosniders Hardware store in Silver Spring, Maryland January 21, 2016. Icy roads and freezing temperatures prompted school closings and emergency preparations in several states in the U.S. South on Wednesday, as snow began to fall on some areas ahead of a major storm expected to blast snow across the Northeast later this week. REUTERS/Gary Cameron

Employee Michael Torney (L) moves a pallet of propane gas tanks at Strosniders Hardware store in Silver Spring, Maryland January 21, 2016. Icy roads and freezing temperatures prompted school closings and emergency preparations in several states in the U.S. South on Wednesday, as snow began to fall on some areas ahead of a major storm expected to blast snow across the Northeast later this week. REUTERS/Gary Cameron

A barge carries a propane truck on Lake Powell near Page, Arizona, May 27, 2015. Lake Powell on the Colorado River provides water for Nevada, Arizona and California. A severe drought in recent years, combined with withdrawals that many believe are not sustainable, has reduced its levels to only about 42 percent of its capacity. REUTERS/Rick WilkingPICTURE 20 OF 26 FOR WIDER IMAGE STORY "EARTHPRINTS: LAKE POWELL"SEARCH "EARTHPRINTS POWELL" FOR ALL IMAGES 

Police search a bag at the site of a bomb scare in Hollywood, California February 19, 2015. A bomb scare triggered by an erratic motorist brandishing a propane tank at a shopping strip near the Hollywood venue for the upcoming Oscars show proved to be a false alarm on Thursday, but the man was detained, Los Angeles police said. Bomb squad investigators cordoned off a row of storefronts and the front entrance of a hotel across the street after a man who was driving recklessly in the area emerged from his car with the propane canister, according to police on the scene. REUTERS/Adrees Latif (UNITED STATES - Tags: CIVIL UNREST CRIME LAW TPX IMAGES OF THE DAY) 

Firefighters and police watch from the corner of Highland Ave and Hollywood Blvd near the site of a bomb scare in Hollywood, California February 19, 2015. A bomb scare triggered by an erratic motorist brandishing a propane tank at a shopping strip near the Hollywood venue for the upcoming Oscars show proved to be a false alarm on Thursday, but the man was detained, Los Angeles police said. Bomb squad investigators cordoned off a row of storefronts and the front entrance of a hotel across the street after a man who was driving recklessly in the area emerged from his car with the propane canister, according to police on the scene. REUTERS/Adrees Latif (UNITED STATES - Tags: CIVIL UNREST CRIME LAW) 

A firefighter watches from inside a firetruck on the corner of Highland Ave and Hollywood Blvd near the site of a bomb scare in Hollywood, California February 19, 2015. A bomb scare triggered by an erratic motorist brandishing a propane tank at a shopping strip near the Hollywood venue for the upcoming Oscars show proved to be a false alarm on Thursday, but the man was detained, Los Angeles police said. Bomb squad investigators cordoned off a row of storefronts and the front entrance of a hotel across the street after a man who was driving recklessly in the area emerged from his car with the propane canister, according to police on the scene. REUTERS/Adrees Latif (UNITED STATES - Tags: CIVIL UNREST CRIME LAW) 

A bomb detection robot searches through a red bag at the site of a bomb scare in Hollywood, California February 19, 2015. A bomb scare triggered by an erratic motorist brandishing a propane tank at a shopping strip near the Hollywood venue for the upcoming Oscars show proved to be a false alarm on Thursday, but the man was detained, Los Angeles police said. Bomb squad investigators cordoned off a row of storefronts and the front entrance of a hotel across the street after a man who was driving recklessly in the area emerged from his car with the propane canister, according to police on the scene. REUTERS/Adrees Latif (UNITED STATES - Tags: CIVIL UNREST CRIME LAW) 

A bomb detection robot leaves the site of a bomb scare in Hollywood, California February 19, 2015. A bomb scare triggered by an erratic motorist brandishing a propane tank at a shopping strip near the Hollywood venue for the upcoming Oscars show proved to be a false alarm on Thursday, but the man was detained, Los Angeles police said. Bomb squad investigators cordoned off a row of storefronts and the front entrance of a hotel across the street after a man who was driving recklessly in the area emerged from his car with the propane canister, according to police on the scene. REUTERS/Adrees Latif (UNITED STATES - Tags: CIVIL UNREST CRIME LAW) 

Police surround a vehicle as a robot leaves the site of a bomb scare in Hollywood, California February 19, 2015. A bomb scare triggered by an erratic motorist brandishing a propane tank at a shopping strip near the Hollywood venue for the upcoming Oscars show proved to be a false alarm on Thursday, but the man was detained, Los Angeles police said. Bomb squad investigators cordoned off a row of storefronts and the front entrance of a hotel across the street after a man who was driving recklessly in the area emerged from his car with the propane canister, according to police on the scene. REUTERS/Adrees Latif (UNITED STATES - Tags: CIVIL UNREST CRIME LAW) 

A bomb disposal robot is seen investigating a suspicious item in a vehicle near the Dolby Theater ahead of the 87th Academy Awards in Hollywood, California February 19, 2015. A bomb scare triggered by an erratic motorist brandishing a propane tank at a shopping strip near the Hollywood venue for the upcoming Oscars show proved to be a false alarm on Thursday, but the man was detained, Los Angeles police said. Bomb squad investigators cordoned off a row of storefronts and the front entrance of a hotel across the street after a man who was driving recklessly in the area emerged from his car with the propane canister, according to police on the scene. REUTERS/Robert Galbraith (UNITED STATES - Tags: ENTERTAINMENT CRIME LAW) 

A propane tank burned by the King Fire is seen in White Meadows, northeast of Sacramento, California September 20, 2014.
Fire crews in California's rugged Sierra Nevada seized on a break in the weather on Friday to slowly gain ground against the blaze threatening to destroy 12,000 homes as it roared for a seventh day through dry timber and brush west of Lake Tahoe. REUTERS/Stephen Lam (UNITED STATES - Tags: DISASTER ENVIRONMENT) 

Hawaii residents line up to fill their propane tanks at a local hardware store as a hurricane and a tropical storm approach the Hawaiian islands, in Mililani, Hawaii, August 5, 2014. A hurricane and a tropical storm are heading west across the Pacific Ocean toward the tourist haven of Hawaii and the U.S. National Hurricane Center said parts of the islands may need to post watches later on Tuesday. Hurricane Iselle was about 1,055 miles (1,700 km) east-southeast of Hawaii, moving west at 9 miles per hour (15 km per hour) with maximum sustained winds of 125 mph (200 kph), the National Hurricane Center said. Further east over the Pacific, Tropical Storm Julio was about 1,145 miles (1,845 km) from Baja California in Mexico and also expected to continue moving west-northwest through Thursday, the NHC said. REUTERS/Hugh Gentry (UNITED STATES - Tags: ENVIRONMENT) 

UPS delivery trucks are seen in New York City March 6, 2014. United Parcel Service Inc is spending $70 million to add 1,000 propane trucks to its delivery fleet, the biggest bulk purchase of propane-fired vehicles yet as output of the fuel in the United States hits record highs. REUTERS/Mike Segar (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) 

UPS delivery trucks are seen in New York City March 6, 2014. United Parcel Service Inc is spending $70 million to add 1,000 propane trucks to its delivery fleet, the biggest bulk purchase of propane-fired vehicles yet as output of the fuel in the United States hits record highs. REUTERS/Mike Segar (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) 

A UPS delivery truck is seen in New York City March 6, 2014. United Parcel Service Inc is spending $70 million to add 1,000 propane trucks to its delivery fleet, the biggest bulk purchase of propane-fired vehicles yet as output of the fuel in the United States hits record highs. REUTERS/Mike Segar (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) 

A UPS delivery truck is seen in New York City March 6, 2014. United Parcel Service Inc is spending $70 million to add 1,000 propane trucks to its delivery fleet, the biggest bulk purchase of propane-fired vehicles yet as output of the fuel in the United States hits record highs. REUTERS/Mike Segar (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) 

UPS delivery trucks are seen in New York City March 6, 2014. United Parcel Service Inc is spending $70 million to add 1,000 propane trucks to its delivery fleet, the biggest bulk purchase of propane-fired vehicles yet as output of the fuel in the United States hits record highs. REUTERS/Mike Segar (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) 

A UPS truck is seen in Washington March 5, 2014. United Parcel Service Inc, the world's largest courier company, said it would buy 1,000 propane-fueled delivery trucks and install 50 fueling stations in the United States as it expands its already-large fleet of alternative-fuel vehicles. REUTERS/Yuri Gripas (UNITED STATES - Tags: TRANSPORT ENERGY) 

UPS truck is seen in Washington March 5, 2014. United Parcel Service Inc, the world's largest courier company, said it would buy 1,000 propane-fueled delivery trucks and install 50 fueling stations in the United States as it expands its already-large fleet of alternative-fuel vehicles. REUTERS/Yuri Gripas (UNITED STATES - Tags: TRANSPORT ENERGY) 

UPS driver delivers parcels in Washington March 5, 2014. United Parcel Service Inc, the world's largest courier company, said it would buy 1,000 propane-fueled delivery trucks and install 50 fueling stations in the United States as it expands its already-large fleet of alternative-fuel vehicles. REUTERS/Yuri Gripas (UNITED STATES - Tags: TRANSPORT ENERGY) 

A UPS delivery person offloads packages from a truck in New York's financial district March 5, 2014. United Parcel Service Inc, the world's largest courier company, said it would buy 1,000 propane-fueled delivery trucks and install 50 fueling stations in the United States as it expands its already-large fleet of alternative-fuel vehicles. REUTERS/Brendan McDermid (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) 

A UPS delivery person offloads packages from a truck in New York's financial district March 5, 2014. United Parcel Service Inc, the world's largest courier company, said it would buy 1,000 propane-fueled delivery trucks and install 50 fueling stations in the United States as it expands its already-large fleet of alternative-fuel vehicles. REUTERS/Brendan McDermid (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) 

A UPS delivery person offloads packages from a truck in New York's financial district March 5, 2014. United Parcel Service Inc, the world's largest courier company, said it would buy 1,000 propane-fueled delivery trucks and install 50 fueling stations in the United States as it expands its already-large fleet of alternative-fuel vehicles. REUTERS/Brendan McDermid (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) 

A UPS delivery truck is seen in New York City March 5, 2014. United Parcel Service Inc, the world's largest courier company, said it would buy 1,000 propane-fueled delivery trucks and install 50 fueling stations in the United States as it expands its already-large fleet of alternative-fuel vehicles. REUTERS/Mike Segar (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) 

A UPS delivery truck is seen in New York City March 5, 2014. United Parcel Service Inc, the world's largest courier company, said it would buy 1,000 propane-fueled delivery trucks and install 50 fueling stations in the United States as it expands its already-large fleet of alternative-fuel vehicles. REUTERS/Mike Segar (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) 

A gas tank on a UPS truck is seen in Evanston, Illinois, March 5, 2014. United Parcel Service Inc, the world's largest courier company, said it would buy 1,000 propane-fueled delivery trucks and install 50 fueling stations in the United States as it expands its already-large fleet of alternative-fuel vehicles. REUTERS/Jim Young (UNITED STATES - Tags: ENERGY BUSINESS TRANSPORT) 

A UPS driver steps onto to his truck in Evanston, Illinois, March 5, 2014. United Parcel Service Inc, the world's largest courier company, said it would buy 1,000 propane-fueled delivery trucks and install 50 fueling stations in the United States as it expands its already-large fleet of alternative-fuel vehicles. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) 

A UPS driver steps off his truck to deliver packages in Evanston, Illinois, March 5, 2014. United Parcel Service Inc, the world's largest courier company, said it would buy 1,000 propane-fueled delivery trucks and install 50 fueling stations in the United States as it expands its already-large fleet of alternative-fuel vehicles. REUTERS/Jim Young (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) 

A UPS delivery truck makes its way through Times Square in New York March 5, 2014. United Parcel Service Inc, the world's largest courier company, said it would buy 1,000 propane-fueled delivery trucks and install 50 fueling stations in the United States as it expands its already-large fleet of alternative-fuel vehicles.
REUTERS/Shannon Stapleton (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) 

A UPS delivery truck is seen in New York March 5, 2014. United Parcel Service Inc, the world's largest courier company, said it would buy 1,000 propane-fueled delivery trucks and install 50 fueling stations in the United States as it expands its already-large fleet of alternative-fuel vehicles.
REUTERS/Shannon Stapleton (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) 

A UPS delivery truck makes its way through Times Square in New York March 5, 2014. United Parcel Service Inc, the world's largest courier company, said it would buy 1,000 propane-fueled delivery trucks and install 50 fueling stations in the United States as it expands its already-large fleet of alternative-fuel vehicles.
REUTERS/Shannon Stapleton (UNITED STATES - Tags: BUSINESS ENERGY TRANSPORT) 

U.S. Energy Secretary Ernest Moniz sits for an interview at the Department of Energy in Washington January 30, 2014. The Department of Energy is continuing to look for ways to mitigate propane shortages in parts of the country that have caused prices of the heating oil to reach record highs, Moniz said on Thursday. To match Interview USA-ENERGY/MONIZ REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS ENERGY BUSINESS) 

U.S. Energy Secretary Ernest Moniz returns to his offices after sitting for an interview at the Department of Energy in Washington January 30, 2014. The Department of Energy is continuing to look for ways to mitigate propane shortages in parts of the country that have caused prices of the heating oil to reach record highs, Moniz said on Thursday. To match Interview USA-ENERGY/MONIZ REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS ENERGY BUSINESS) 

U.S. Energy Secretary Ernest Moniz sits for an interview at the Department of Energy in Washington January 30, 2014. The Department of Energy is continuing to look for ways to mitigate propane shortages in parts of the country that have caused prices of the heating oil to reach record highs, Moniz said on Thursday. To match Interview USA-ENERGY/MONIZ REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS ENERGY BUSINESS) 

Arenson Oil and Propane delivery driver Don Bedford fills up an empty propane tank in Sandwich, Illinois January 29, 2014. Propane inventories in the United States fell last week, with stocks in the Midwest also dropping again, a government report said January 29, 2014, pushing up spot prices in the key trading and storage hubs of Kansas and Texas. REUTERS/Jeff Haynes (UNITED STATES - Tags: ENERGY BUSINESS ENVIRONMENT) 

Arenson Oil and Propane delivery driver Don Bedford fills up his empty 3000 gallon truck from the company's 26,000 gallon holding tank in Sheridan, Illinois January 29, 2014. Propane inventories in the United States fell last week, with stocks in the Midwest also dropping again, a government report said January 29, 2014, pushing up spot prices in the key trading and storage hubs of Kansas and Texas. REUTERS/Jeff Haynes (UNITED STATES - Tags: ENERGY BUSINESS ENVIRONMENT) 

Arenson Oil and Propane delivery driver Don Bedford fills up his empty 3000 gallon truck from the company's 26,000 gallon holding tank in Sheridan, Illinois January 29, 2014. Propane inventories in the United States fell last week, with stocks in the Midwest also dropping again, a government report said January 29, 2014, pushing up spot prices in the key trading and storage hubs of Kansas and Texas. REUTERS/Jeff Haynes (UNITED STATES - Tags: ENERGY BUSINESS ENVIRONMENT) 

Arenson Oil and Propane delivery driver Don Bedford pulls the hose to fill up empty propane tanks in Sandwich, Illinois January 29, 2014. Propane inventories in the United States fell last week, with stocks in the Midwest also dropping again, a government report said January 29, 2014, pushing up spot prices in the key trading and storage hubs of Kansas and Texas. REUTERS/Jeff Haynes (UNITED STATES - Tags: ENERGY BUSINESS ENVIRONMENT) 

Arenson Oil and Propane delivery driver Don Bedford fills up his empty 3000 gallon truck from the company's 26,000 gallon holding tank in Sheridan, Illinois January 29, 2014. Propane inventories in the United States fell last week, with stocks in the Midwest also dropping again, a government report said January 29, 2014, pushing up spot prices in the key trading and storage hubs of Kansas and Texas. REUTERS/Jeff Haynes (UNITED STATES - Tags: ENERGY BUSINESS ENVIRONMENT) 

Arenson Oil and Propane delivery driver Don Bedford fills up an empty propane tank in Sandwich, Illinois January 29, 2014. Propane inventories in the United States fell last week, with stocks in the Midwest also dropping again, a government report said January 29, 2014, pushing up spot prices in the key trading and storage hubs of Kansas and Texas. REUTERS/Jeff Haynes (UNITED STATES - Tags: ENERGY BUSINESS ENVIRONMENT) 

Arenson Oil and Propane delivery driver Don Bedford looks over the cards of his next stop to fill empty propane tanks in Sandwich, Illinois January 29, 2014. Propane inventories in the United States fell last week, with stocks in the Midwest also dropping again, a government report said January 29, 2014, pushing up spot prices in the key trading and storage hubs of Kansas and Texas. REUTERS/Jeff Haynes (UNITED STATES - Tags: ENERGY BUSINESS ENVIRONMENT) 

Arenson Oil and Propane delivery driver Don Bedford fills up an empty propane tank in Plano, Illinois January 29, 2014. Propane inventories in the United States fell last week, with stocks in the Midwest also dropping again, a government report said January 29, 2014, pushing up spot prices in the key trading and storage hubs of Kansas and Texas. REUTERS/Jeff Haynes (UNITED STATES - Tags: ENERGY BUSINESS ENVIRONMENT) 

Arenson Oil and Propane delivery driver Don Bedford fills up an empty propane tank in Plano, Illinois January 29, 2014. Propane inventories in the United States fell last week, with stocks in the Midwest also dropping again, a government report said January 29, 2014, pushing up spot prices in the key trading and storage hubs of Kansas and Texas. REUTERS/Jeff Haynes (UNITED STATES - Tags: ENERGY BUSINESS ENVIRONMENT) 

Arenson Oil and Propane delivery driver Don Bedford fills up an empty propane tank in Sandwich, Illinois January 29, 2014. Propane inventories in the United States fell last week, with stocks in the Midwest also dropping again, a government report said January 29, 2014, pushing up spot prices in the key trading and storage hubs of Kansas and Texas. REUTERS/Jeff Haynes (UNITED STATES - Tags: ENERGY BUSINESS ENVIRONMENT) 

The meter shown on the back of the Arenson Oil and Propane delivery truck during a stop in Sandwich, Illinois January 29, 2014. Propane inventories in the United States fell last week, with stocks in the Midwest also dropping again, a government report said January 29, 2014, pushing up spot prices in the key trading and storage hubs of Kansas and Texas. REUTERS/Jeff Haynes (UNITED STATES - Tags: ENERGY BUSINESS ENVIRONMENT) 

Arenson Oil and Propane delivery driver Don Bedford fills up an empty propane tank in Sandwich, Illinois January 29, 2014. Propane inventories in the United States fell last week, with stocks in the Midwest also dropping again, a government report said January 29, 2014, pushing up spot prices in the key trading and storage hubs of Kansas and Texas. REUTERS/Jeff Haynes (UNITED STATES - Tags: ENERGY BUSINESS ENVIRONMENT) 

Arenson Oil and Propane delivery driver Don Bedford watches the meter while he fills up an empty propane tank in Sandwich, Illinois January 29, 2014. Propane inventories in the United States fell last week, with stocks in the Midwest also dropping again, a government report said January 29, 2014, pushing up spot prices in the key trading and storage hubs of Kansas and Texas. REUTERS/Jeff Haynes (UNITED STATES - Tags: ENERGY BUSINESS ENVIRONMENT) 

Arenson Oil and Propane delivery driver Don Bedford fills up an empty propane tank at residents in Sandwich, Illinois January 29, 2014. Propane inventories in the United States fell last week, with stocks in the Midwest also dropping again, a government report said January 29, 2014, pushing up spot prices in the key trading and storage hubs of Kansas and Texas. REUTERS/Jeff Haynes (UNITED STATES - Tags: ENERGY BUSINESS ENVIRONMENT) 

The gauge on the Arenson Oil and Propane delivery truck shows low during a stop in Sandwich, Illinois January 29, 2014. Propane inventories in the United States fell last week, with stocks in the Midwest also dropping again, a government report said January 29, 2014, pushing up spot prices in the key trading and storage hubs of Kansas and Texas. REUTERS/Jeff Haynes (UNITED STATES - Tags: ENERGY BUSINESS ENVIRONMENT) 

A propane delivery truck is pictured near Rutland, Vermont January 26, 2014. A shortage of propane heating fuel during a brutal U.S. cold snap this month threatens to sharpen the year's most urgent energy policy debate. Millions felt the pinch last week as another wave of biting, bitter cold strained already low propane supplies in the Midwest, causing prices to surge three-fold over two weeks to record highs and forcing suppliers to ration deliveries. Picture taken January 26, 2014. To match Analysis ENERGY-PROPANE/USA REUTERS/Mike Segar (UNITED STATES - Tags: ENERGY ENVIRONMENT) 

A propane delivery truck is pictured near Rutland, Vermont January 26, 2014. A shortage of propane heating fuel during a brutal U.S. cold snap this month threatens to sharpen the year's most urgent energy policy debate. Millions felt the pinch last week as another wave of biting, bitter cold strained already low propane supplies in the Midwest, causing prices to surge three-fold over two weeks to record highs and forcing suppliers to ration deliveries. Picture taken January 26, 2014. To match Analysis ENERGY-PROPANE/USA REUTERS/Mike Segar (UNITED STATES - Tags: ENERGY ENVIRONMENT) 

A delivery truck driver prepares to fill a customer's tank with propane near Rutland, Vermont January 26, 2014. A shortage of propane heating fuel during a brutal U.S. cold snap this month threatens to sharpen the year's most urgent energy policy debate. Millions felt the pinch last week as another wave of biting, bitter cold strained already low propane supplies in the Midwest, causing prices to surge three-fold over two weeks to record highs and forcing suppliers to ration deliveries. Picture taken January 26, 2014. To match Analysis ENERGY-PROPANE/USA REUTERS/Mike Segar (UNITED STATES - Tags: ENERGY ENVIRONMENT) 

A delivery truck driver climbs into his propane truck near Rutland, Vermont January 26, 2014. A shortage of propane heating fuel during a brutal U.S. cold snap this month threatens to sharpen the year's most urgent energy policy debate. Millions felt the pinch last week as another wave of biting, bitter cold strained already low propane supplies in the Midwest, causing prices to surge three-fold over two weeks to record highs and forcing suppliers to ration deliveries. Picture taken January 26, 2014. To match Analysis ENERGY-PROPANE/USA REUTERS/Mike Segar (UNITED STATES - Tags: ENERGY ENVIRONMENT) 

CN workers work on the railway in Plaster Rock, New Brunswick, January 8, 2014. A Canadian National Railway train carrying crude oil and propane derailed and caught fire in New Brunswick on Tuesday night after the emergency brakes were activated, federal safety officials said on Wednesday. REUTERS/Mathieu Belanger (CANADA - Tags: DISASTER ENERGY TRANSPORT) 

A CN worker looks on while working on the railway in Plaster Rock, New Brunswick, January 8, 2014. A Canadian National Railway train carrying crude oil and propane derailed and caught fire in New Brunswick on Tuesday night after the emergency brakes were activated, federal safety officials said on Wednesday. REUTERS/Mathieu Belanger (CANADA - Tags: DISASTER ENERGY TRANSPORT) 

Flames and smoke are seen at the site of a train derailment in Wapske, New Brunswick, January 8, 2014. A Canadian National Railway train carrying propane and crude oil derailed and caught fire on Tuesday in northwest New Brunswick, Canada, the latest in a string of train accidents that have put the surging crude-by-rail business under heavy scrutiny. No one was injured but about 45 nearby homes were evacuated. REUTERS/Mathieu Belanger (CANADA - Tags: DISASTER ENERGY TRANSPORT)