A freight train derailed today in the center of Lytle, southwest of San Antonio.


  "Between 20 and 25 cars derailed," said Raquel Espinoza of the Union Pacific.  "Fortunately there were no injuries."


  She says there were also no hazardous materials involved.


  "These cars were empty sand cars that left the Gardendale area, they were headed to our East Yard in San Antonio."


  The investigation is underway into what caused the derailment.