Two CSX train crew members have been killed and two others injured when a pair of freight trains collided in Union County, N.C.

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CSX spokesman Bob Sullivan said the locomotives were traveling through Mineral Springs when one train struck the other from behind about 3:45 a.m. Tuesday.

County officials said one of the railroad employees died at the scene. The other was pronounced dead at Carolinas Medical Center in Charlotte. Two additional crew members were treated at the scene.

One train had 12 freight cars and was traveling from Atlanta to Charlotte. The other had nine freight cars and was heading to Hamlet from New Orleans.

Both trains derailed and five homes near the track were evacuated when a fire started. CSX officials said no hazardous materials were involved.