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Sparks from a cutting torch are apparently responsible for a blaze late Thursday morning at a railroad yard in Youngstown, officials said.
City firefighters were called to the Norfolk-Southern yard off Wilson Avenue.
Investigators said workers were using the torch to cut a hole on the outside of a car carrying steel coils headed for the General Motors complex in Lordstown when a spark ignited wood pallets inside the car, damaging the coils.
It took about 90 minutes to extinguish the flames.