transport authorities reported “a structural fault” in one of the metro line’s supporting columns, which had affected its ability to support heavy weight.

In 2018, senators from the opposition Institutional Revolutionary Party called for Mexico City authorities to inform Congress about irregularities in the funding of the subway line’s expansion. In an official party document, the opposition lawmakers called the Golden Line a “symbol of corruption and the misuse of public resources that prevailed during that administration.”

The lawmakers cited a congressional inquiry into the faulty line which found that “the modifications to the basic engineering, to the original layout with the change of underground stations to elevated stations, severely affected the technical operating conditions” of the subway line.

Residents living near the scene of the accident said government workers had fixed the column shortly after the earthquake. But they expressed doubt about the quality of the reconstruction, after seeing how many shutdowns and maintenance issues the line had over the years.

Hernando Manon, 42, was walking home from work Monday night when he felt a tremor and heard a loud crash a few hundred yards up the street.

“There was a rumbling and then sparks. The lights went out, and we didn’t know what happened. Then we heard the sirens,” Mr. Manon said, standing just a few hundred yards from the site of the accident. “As we approached, we realized that the subway had collapsed.”

Families rushed to the scene, he said, hoping to find their loved ones and yelling at the police demanding to be let through the cordon they had erected around the wreckage.

2018-2030 Master Plan for the subway system detailed major backlogs to the maintenance of tracks and trains and warned that trains could be derailed on the Golden Line unless major repairs were undertaken. It is unclear whether those needed repairs were ever carried out.

Since becoming mayor of the capital in 2018, Ms. Sheinbaum, who is closely aligned with the president’s pursuit of austerity, has presided over cuts to spending on the subway system.

For a year, the city did not appoint a director of infrastructure maintenance for the subway system. Ms. Sheinbaum only filled the role last week.

two subway trains collided in Mexico City. Then in January, a fire ripped through the subway’s headquarters in downtown Mexico City, killing a police officer and sending 30 others to hospital.

At a news conference on Tuesday, both Ms. Sheinbaum and Mr. Ebrard faced harsh questioning from reporters. Publicly, at least, the two political heavyweights presented a united front.

“We are in agreement to get to the bottom of this and work together to find the truth and know what caused this incident,” Ms. Sheinbaum said.

“If you have nothing to hide, you have nothing to fear,” Mr. Ebrard said. “Like anyone else, I am subject to whatever the authorities determine, but even more so as a high-level official, as someone who promoted the construction of the line.”

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