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FILE - In this May 4, 2021 file photo, subway cars dangle at an angle from a collapsed elevated section of the metro in Mexico City, the day after the collapse. A preliminary report on June 16, 2021, by experts into the collapse that killed 26 people placed much of the blame on poor welds in studs that joined steel support beams to a concrete layer supporting the trackbed. (AP Photo/Fernando Llano, File)