Nation 3 dead, 7 hospitalized: What caused fatal Amtrak derailment in Montana? Federal investigation probe accident September 26, 2021September 26, 2021 John Bacon, USA TODAY Comments Off on 3 dead, 7 hospitalized: What caused fatal Amtrak derailment in Montana? Federal investigation probe accident Amtrak joined federal safety officials Sunday to investigate the Empire Builder train derailment that left at least 3 people dead and 7 hospitalized.