The tractor-trailer was attempting to turn Tuesday morning when it backed onto the train tracks and was struck by a Norfolk Southern train, Dan Stevens, Westmoreland County, Pa., deputy emergency services coordinator said.
A 55-gallon drum of the flammable cleaning agent xylene spilled inside the trailer and out the back door, Stevens said, adding Hazmat crews responded to contain the chemical.
Three engines and three cars of the train derailed.
The truck driver was hospitalized for a bruise on the head but no other injuries were reported, the Pittsburgh Post-Gazette said Tuesday.
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