The Platte Bridge Railroad Tragedy was a bushwhacker attack on the Hannibal and St. Joseph Railroad during the American Civil War on September 3, 1861, in which the train derailed on a bridge over the Platte River east of St. Joseph, Missouri, killing between 17 and 20 and injuring 100. The bridge crosses the river in Buchanan County, between Marion Township on the east, and Washington Township on the west.