![A train derailment near Alton, Iowa, United States is seen in this still image taken from a September 23, 2018 video. The accident demolished a bridge. About 20 cars carrying soybean oil and sand fell into the rain-swollen Floyd River. Authorities say no one was injured. (Photo/Agencies)](http://www.ecns.cn/hd/2018/09/24/29a722c276d94daa9fd3c5b38df6a0b0.jpg)
A train derailment near Alton, Iowa, United States is seen in this still image taken from a September 23, 2018 video. The accident demolished a bridge. About 20 cars carrying soybean oil and sand fell into the rain-swollen Floyd River. Authorities say no one was injured. (Photo/Agencies)
![A train derailment near Alton, Iowa, United States is seen in this still image taken from a September 23, 2018 video. The accident demolished a bridge. About 20 cars carrying soybean oil and sand fell into the rain-swollen Floyd River. Authorities say no one was injured. (Photo/Agencies)](http://www.ecns.cn/hd/2018/09/24/b8b2b84a711547bab1107d43bc042423.jpg)
A train derailment near Alton, Iowa, United States is seen in this still image taken from a September 23, 2018 video. The accident demolished a bridge. About 20 cars carrying soybean oil and sand fell into the rain-swollen Floyd River. Authorities say no one was injured. (Photo/Agencies)
![A train derailment near Alton, Iowa, United States is seen in this still image taken from a September 23, 2018 video. The accident demolished a bridge. About 20 cars carrying soybean oil and sand fell into the rain-swollen Floyd River. Authorities say no one was injured. (Photo/Agencies)](http://www.ecns.cn/hd/2018/09/24/423436c4ecf34c3ca97bdbb991f3f09e.jpg)
A train derailment near Alton, Iowa, United States is seen in this still image taken from a September 23, 2018 video. The accident demolished a bridge. About 20 cars carrying soybean oil and sand fell into the rain-swollen Floyd River. Authorities say no one was injured. (Photo/Agencies)