As rescuers sift through the remains of Spain's deadly train crash, take a look at the world's deadliest rail accidents.
6. Ufa (Russia, 1989) -- A leaking natural gas pipeline created a highly-flammable cloud that was ignited by sparks from two nearby passenger trains, causing an explosion that killed 575 people.
Joel Page / Reuters
Philip Andrews / Reuters
Keystone Resort/Ben Lindbloom
SRI International via Wikimedia Commons
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