As a result of the collision, some 5,000 gallons of diesel fuel spewed from one of the engines. None of the oil was ignited but fire officials established a danger zone with a half-mile radius of the crash and evacuated more than 100 homes. The Red Cross has been attending to evacuees at a nearby middle school.
The crash occurred near Slinger, Wisconsin, roughly 35 miles northwest of Milwaukee.
Early reports didn't offer details on the nature or cause of the collision, confirming only that Canadian National Railway Co. and Wisconsin & Southern cars were involved, and that at least 10 railcars and three engines had derailed.
The mess of spilled fuel was complicated by the spilled contents of the 10 railcars, including sand and lumber.