An estimated 230,000 gallons (870,619 liters) of crude oil spilled into floodwaters in the northwestern corner of Iowa following a train derailment, a railroad official said Saturday. In this aerial drone image taken from video and provided by the Sioux County Sheriff's Office, tanker cars carrying crude oil are shown derailed about a mile south of Doon, Iowa, Frida, June 22, 2018.