As rescuers sift through the remains of Spain's deadly train crash, take a look at the world's deadliest rail accidents.
5. Guadalajara (Mexico, 1915) -- More than 600 are killed when a train packed with an estimated 900 people veered off the tracks between Colima and Guadalajara and plunged into a deep ravine.
Keystone Resort/Ben Lindbloom
Jessica Rinaldi / Reuters
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