Rapidly warming temperatures in the past two weeks have led to significant snow melt, that when combined with recent rains, have inundated river and their tributaries throughout the Great Plains.
BNSF reports that much of its mainline trackage in South Dakota is out of service, along with its main line from Alliance to Omaha, Neb.
Union Pacific specifically calls out service disruptions on its Omaha, Blair, Columbus, Lincoln, and Falls City subdivision, mostly near the Missouri River in Iowa and Nebraska. A full UP embargoed line list is online.
The National Weather Service has extended flood warnings for Omaha through March 23; though Monday for Lincoln, Neb. Elsewhere, the weather service has posted flood warnings for St. Louis, on the Mississippi River until further notice; for Cedar Rapids, Iowa, until March 23; and Memphis through March 31.