WOLF POINT, Mont. — It’s tough to miss the trains hauling crude oil out of the Northern Plains. They are growing more frequent by the day, mile-long processions of black tank cars that rumble through wheat fields and towns, along rivers and national parks.

As common as they have become across the U.S. and Canada, officials in dozens of towns and cities where the oil trains travel say they are concerned with the possibility of a major derailment, spill or explosion, while their level of preparation varies widely.

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