"We'll want to know if it was the actual cause of the derailment, or was it broken during the derailment?" National Transportation Safety Board member Robert Sumwalt said.
Investigators at the scene have found nothing wrong with the railroad track or with signals along the tracks. Interviews of train crews were to begin as early as Thursday, Sumwalt said, and investigators have other work to finish such as developing a detailed timeline of the incident and going through shipping records.
"Our investigative teams will be here through the weekend," he said. "We are in the very early stages of the investigation, but even still we are making good progress."
The NTSB
said earlier that a westbound BNSF Railway train carrying grain
derailed first Monday afternoon, and a portion of it fell onto an
adjacent track carrying the eastbound BNSF oil train. Eighteen cars on
the 106-car oil train derailed and several burned. No one was hurt, but
many of the 2,400 residents in nearby Casselton temporarily evacuated
due to potentially unsafe air.
"We
believe it to be a very short window," he said of the time that elapsed
between the grain train derailing and colliding with the oil train.
"Not a matter of minutes but something probably less than a minute. We
think it was very quick."
Residents
of Casselton were welcoming a return to normalcy Wednesday while
railway crews spent New Year's Day working in subzero weather to get the
track ready to reopen Thursday.
Mayor
Ed McConnell was back at his trucking business, finishing year-end work
he said he typically completes the day before the holiday.
Earlier, McConnell called for federal lawmakers to address safety concerns posed by transporting oil by rail.
"There
have been numerous derailments in this area," he told The Associated
Press. "It's almost gotten to the point that it looks like not if we're
going to have an accident, it's when."
While
the rate of oil train accidents remains low, there has been a sharp
increase in the past several years in the number resulting in accidental
releases. That increase is being driven by a surge in drilling in North
Dakota and other western states.
Casselton's
voluntary evacuation recommendation was lifted Tuesday afternoon after
air quality tests, and a Red Cross shelter set up at the high school was
shut down.
Renee Steen, who
lives with her family about half a mile from the crash site, stayed
temporarily with a friend in Fargo, about 25 miles to the east. She was
back in her home Wednesday, watching through her window as crews worked
at the crash scene. There was no smoke damage inside her home, she said.
"We
noticed a lot of soot in the snow in our yard, and we are going to be
changing out our furnace filter as a precaution," she said.
The
railroad expected to reopen both lines in the Casselton area about
midnight, spokeswoman Amy McBeth said. Rail traffic in the meantime was
being rerouted on other lines. McBeth said there might be some train
delays but she was not aware of any major backups.
The
railroad planned to open a claims center at 8 a.m. Thursday at the Days
Inn Casselton for residents with evacuation-related expenses or with
interrupted businesses due to the derailment
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