As rescuers sift through the remains of Spain's deadly train crash, take a look at the world's deadliest rail accidents.
8. Balvano (Italy, 1944) -- Some 426 people illegally riding a steam-hauled freight train died of carbon monoxide poisoning when the train stalled on a steep gradient in the Armi tunnel near Balvano in southern Italy.
Pete Souza/White House Photo
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