Union Pacific officials say six freight cars have derailed in San Antonio in an accident that dumped loads of coal along the tracks.
Nobody was hurt in the derailment before dawn Friday on the south side of San Antonio. Crews worked to clear the accident site.
UP spokeswoman Calli Hite says the derailment involved a 140-car train bound from Wyoming to Elmendorf, southeast of San Antonio. Four of the derailed cars overturned. The train had a two-person crew.
Hite says the cause of the derailment remains under investigation.