No injuries were reported.
The Union Pacific train, which was heading to the Edgewater power plant in Sheboygan, derailed at about 6 a.m. Sunday in Caledonia, Wis., the Racine (Wis.) Journal Times reported.
Nineteen of the train's 135 cars were came off the track, said Jeff Plale, the Wisconsin railroad commissioner.
"It looks bad anytime you see twisted metal. It doesn't look good, but really it's not a major incident," Plale said.
The derailment was likely caused by a crack in the tracks created by recent cold temperatures.
"Whenever it gets really hot or really cold, that affects the rails," Plale said. "When it gets super cold, tracks get brittle and can crack like what (appears to have) happened here. When it gets super hot, steel expands."
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