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To clear the tracks near Matteson, gas is burned from derailed wagons.

Canadian National Railway will burn liquefied natural gas from nearly a dozen train cars that derailed in Matteson on Thursday, the company said Friday.

CN freight trains have resumed running through the area near the derailment since Friday afternoon, company spokeswoman Ashley Michnowski said.

A controlled burn – called “flaring” – will be used to rid all 11 cars of the liquid gas inside, Michnowski said. Once that process is complete, the derailed train will be taken to a nearby Canadian National Railroad Station. For now, the derailed cars will remain near the tracks.

Michnowski compared the flaring process to using a barbecue lighter. A pipe attached to each tanker will be used to burn off the fumes, she said. There will be “no smell or smoke,” she added.

According to a spokesperson for the Illinois Commerce Commission, the Illinois EPA will also be on site to assist with cleanup and response efforts.

“There is no threat to public safety or the environment,” Michnowski said in a statement. “Out of an abundance of caution, CN will monitor air quality. We are working closely with government agencies and local authorities and will keep them updated on our cleanup efforts.”

A mandatory evacuation order was issued for Matteson residents living within a mile of the derailment after 25 cars of a Canadian National Railway train jumped the tracks near the corner of 218th and Main streets around 10:30 a.m. Thursday. One car carrying “liquid petroleum gas residue” spilled, the company said. No other injuries were reported.

A “trace amount” had leaked from the derailed tanker, the Illinois State Environmental Protection Agency said on Thursday. No further leaks had occurred from wagons carrying hazardous materials.

The Federal Railroad Administration will lead the investigation into the derailment, agency officials said. Investigators were on the scene Friday, but details were not available. The agency requires the railroads to file a report detailing their version of events. The deadline for CN to file that report is late July, but the report will not be available to the public until October at the earliest, agency officials told the Sun-Times.

According to the Federal Railroad Administration, investigations can vary depending on the situation, but the goal is to complete most investigations within 270 days and then issue an official report.

As part of the investigation, the agency will test tracks and equipment, interview train crews and CN employees, review the railroad’s maintenance and inspection records and retrieve data from the train’s flight recorder (also called an event recorder).

According to an agency representative, the ICC will also inspect the railroad crossing closest to the derailment site to ensure that the warning devices and the railroad crossing surface comply with state regulations.

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