MEXICO CITY: A preliminary report by experts into the collapse of a Mexico City elevated subway line that killed 26 people placed much of the blame on Wednesday on poor welds in studs that joined steel support beams to a concrete layer supporting the track bed.
But the studs were found to be still carrying ceramic rings that covered the welds. Used as a safety and control method to contain the molten steel, the rings were supposed to have been knocked off after welding so inspectors could see the welds themselves. The fact they were left in place may suggest the welds were not properly inspected.
Photos of people who died in a metro collapse hang at the site of the now missing section in Mexico City on Jun 16, 2021. Experts said unusually sharp curves in the route exacerbated problems with the wheels-on-steel track design, which more resembles New York’s subway rather than the European-style rubber tires used on the rest of the system.
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