Grupo Carso had no immediate comment on the report, nor did ICA respond to a request by the Reuters news agency for comment while a representative for Alstom could not be reached.Ĭarso would repair the line at no cost to the government so that it can reopen in a year, Lopez Obrador said in June.ĭNV’s initial report found “six deficiencies in the construction process” that contributed to the accident and noted inadequate bolts and deformed structural supports. The metro was built by a consortium of Mexico’s ICA, Grupo Carso, a company controlled by Slim’s family, and French train maker Alstom SA. The government of Mexico City has already started working on rehabilitation of Line 12, also known as the Golden Line They will be doing the work,” Esteva said, without adding further details. “In the next few days we will be signing the agreements with the companies. The city government has already started working on rehabilitation of the line, and the report’s findings will be shared with a technical advisory committee, said Jesus Esteva, head of Mexico City’s public works department. Poor welding practices were also observed by the auditor. Sections of the collapsed overpass were in “compromised condition” before a serious 2017 earthquake that caused damage to parts of the metro, the report said. The firm said other possible factors included deficiencies in the beams themselves and the design of the framework. “This created conditions that led to the distortion of the central transverse frame and the initiation and propagation of fatigue cracks that further reduced the capacity of the structure to support the load,” the report said. The deficiencies left the structure operating as two independent girders that took on weight it was not designed to handle. In the second phase of DNV’s findings shared by city officials, the firm said deficiencies, including a lack of functional bolts over a significant stretch of the line, led to the buckling of north and south beams.
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