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A Central American migrant gets on the so-called La Bestia (The Beast) cargo train, in an attempt to reach the US border, in Apizaco, Tlaxcala state, Mexico on July 22, 2014. AFP PHOTO/RONALDO SCHEMIDT / AFP / RONALDO SCHEMIDT (Photo credit should read RONALDO SCHEMIDT/AFP via Getty Images)

A Central American migrant gets on the so-called La Bestia (The Beast) cargo train, in an attempt to reach the US border, in Apizaco, Tlaxcala state, Mexico on July 22, 2014. AFP PHOTO/RONALDO SCHEMIDT / AFP / RONALDO SCHEMIDT        (Photo credit should read RONALDO SCHEMIDT/AFP via Getty Images)