(Radio Iowa) — It’s still not known what caused several cars of a freight train to jump the tracks last (Sunday) night in the northern Iowa town of Manly, forcing the closure of a nearby highway. The Manly Police Department responded to the Union Pacific crossing at State Highway 9 last night after the report of some grain cars being derailed. The Iowa Department of Transportation says the roadway re-opened at about 6:15 this morning. No injuries were reported due to the derailment.