ALEDO, Texas (AP) — A Union Pacific Railroad line in North Texas has reopened after nine cars and locomotives went off the tracks and one crewmember was hurt. Company spokesman Mark Davis said Friday that the injured worker has been treated and released following the derailment near Aledo. Authorities are trying to determine what caused the accident before dawn Thursday in an area about 15 miles southwest of Fort Worth. No cargo spilled in the accident involving a train bound from Tucson, Ariz., to Dallas. Davis says the line reopened Thursday night. Union Pacific is based in Omaha, Neb.