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What went wrong? Questions and theories about what caused the metro tragedy in Mexico City A lack of maintenance, design errors, poorly executed construction and negligence all dominate the discussion after the accident this week. EL PAÍS analyzes the key factors Experts believe that the accident stemmed from a break in the joint of the horizontal girders. Raised bridge Tláhuac Avenue The structure collapsed under the weight of the train. The girders opened like a book and trapped the metro vehicle. Experts believe that the accident stemmed from a break in the joint of the horizontal girders. Raised bridge

Mexico cityDistrito federalSergio alcocerUriel perretClaudia sheinbaumFlorencia serranJorge gaviFernando zamoranoMarcelo ebrardFernando espinoFrancisco garcSchool of engineeringNational technological university of argentinaNational autonomous university of mexicoMexican association of structural engineeringAttorney general