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SANTIAGO DE COMPOSTELA, Spain-- A Spanish train that hurtled off the rails and smashed into a security wall as it rounded a bend was going so fast that carriages tumbled off the tracks like dominos, killing 80 people and maiming dozens more, according to eyewitness accounts and video footage obtained Thursday.

A Houston couple was among the dozens injured.

An Associated Press analysis of video images suggests the train may have been traveling at twice the speed limit, or more, along that curved stretch of track.

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