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Subway train derails in Mexico City, killing more than 20 people

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thackney:
Subway train derails in Mexico City, killing more than 20 people
https://www.axios.com/mexico-city-subway-train-derails-deadly-collapse-eed34896-d861-47a4-a1ad-1f961c5160ec.html

A subway train derailed in Mexico City after an overpass partially collapsed onto a road Monday night, killing at least 23 people and wounding dozens of others.

Details: Mexico City Mayor Claudia Sheinbaum told reporters early Tuesday that children were among the dead, and 49 wounded people had been taken to hospitals.

The crash happened at 10:25 p.m on Line 12 of the subway system, which opened in 2012, at the Olivos Station in the capital's southeast, according to La Jornada.

Milenio TV broadcast footage showing the overpass collapsing onto cars on the road below it.
Sheinbaum said a "support beam gave way," causing the overpass to collapse, AP reports.

The rescue operation paused at midnight as workers brought in a crane to support the "very weak" train, per AP....


https://www.youtube.com/watch?v=pXUEqw52bro

thackney:
...Mexico City Mayor Claudia Sheinbaum said an external company would investigate the cause of the incident. Earlier, she said it appeared a girder had given way on the overpass. The line, inaugurated less than a decade ago, will remain closed while a structural survey is carried out....

...Residents had reported cracks in the structure after a deadly 2017 earthquake, according to local media. Mexico's El Universal newspaper says transport authorities made repairs following the reports....

https://www.bbc.com/news/world-latin-america-56977129

Fishrrman:
Take a look at the images above.

The uprights remained upright.

What failed is that the supporting steel underneath the concrete "trough" that carries the track - it seems to have been "jointed" in between the uprights.

Also, there appears to have been a switch directly above the point of derailment. I'm wondering if it was a switch failure (and resulting derailment) that contributed to the accident.

Those were essentially "light rail" cars, not "heavy rail equipment" (as in a locomotive-drawn passenger train). That structure must have been pretty weak if it couldn't support them.

Again, looks like "a joint" directly underneath the point of failure...

thackney:

--- Quote from: Fishrrman on May 05, 2021, 06:28:50 PM ---Take a look at the images above.

The uprights remained upright.

What failed is that the supporting steel underneath the concrete "trough" that carries the track - it seems to have been "jointed" in between the uprights.

Also, there appears to have been a switch directly above the point of derailment. I'm wondering if it was a switch failure (and resulting derailment) that contributed to the accident.

Those were essentially "light rail" cars, not "heavy rail equipment" (as in a locomotive-drawn passenger train). That structure must have been pretty weak if it couldn't support them.

Again, looks like "a joint" directly underneath the point of failure...

--- End quote ---

Watch the video.  The beams fell long before the rail cars traveled and fell.  It was not a derailment that caused the structural failure.  The rail cars followed the failure.

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