Iowa emergency management officials say rail cars carrying millions of gallons of crude oil from North Dakota’s Bakken region regularly travel through the Siouxland area.
The disclosure comes from the Iowa Department Homeland Security and Emergency Management in response to a freedom of information request from The Associated Press.
It says the Burlington Northern-Santa Fe Railway Co. sends three trains a week through Woodbury, Plymouth, Sioux and Lyon counties.
Railroads have been required since May by the U.S. Department of Transportation to notify state officials about trains carrying at least 1 million gallons of oil.
Federal officials are pressuring railroad regulators to improve safety after repeated derailments.
That includes one in a small Canadian city in eastern Quebec province where 47 people were killed last July when 60 cars derailed and exploded.