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Mexico City Metro viaduct collapse

Train accident

Top 3 Mexico City Metro viaduct collapse related articles

2021 Mexico City Metro viaduct collapse
The accident minutes after the collapse
Location within Mexico City
Date3 May 2021 (2021-05-03)
22:25 CDT (UTC-05:00)
LocationTezoncoOlivos elevated interstation
Tláhuac Avenue, Tláhuac, Mexico City
Coordinates19°18′18″N 99°03′41″W / 19.3049°N 99.0613°W / 19.3049; -99.0613Coordinates: 19°18′18″N 99°03′41″W / 19.3049°N 99.0613°W / 19.3049; -99.0613
LineLine 12
OperatorMexico City Metro
Incident typeRailway collapse
CauseUnder investigation
Injured70+ (65 hospitalized)

On 3 May 2021 at 22:25 CDT, an elevated section on Line 12 of the Mexico City Metro collapsed between Olivos and Tezonco stations in Mexico City, Mexico. At least 24 people have been confirmed dead, 21 died at the scene, and three others were pronounced dead at hospitals.[1] Opened in 2012, Line 12 is the newest line in the system.

Mexico City Metro viaduct collapse Intro articles: 3


The system

The Mexico City Metro, operated by the Sistema de Transporte Colectivo (STC),[1] is one of the busiest in the world, carrying around 4.5 million passengers a day.[2][3] Opened in 1969, it is the second-largest metro system in the Americas after the New York City Subway. Before the crash, it had showed signs of disrepair and there were general concerns about the maintenance of the system's "dilapidated infrastructure".[4][5]

In March 2020, two trains collided at Tacubaya station after one driver did not follow protocols and the train's brakes failed.[6] In January 2021, a fire in the Metro's downtown headquarters killed a police officer and hospitalized 30 people. Six subway lines were out of service for weeks.[4][7] In April, Line Four was shut down after a track fire.[4]

Line 12

Black-and-white picture of the Olivos–Tezonco viaduct in 2016. The accident took place near the Walmart sign.

Line 12 (also known as the Golden line), whose construction began in September 2008, is the newest line of the Metro system.[8] It was built by Grupo ICA [es] in association with Alstom Mexicana and Grupo Carso.[9] The line was opened in October 2012 by President Felipe Calderón and the head of government of Mexico City, Marcelo Ebrard.[4][10] From the onset of service, it faced issues with trains on elevated sections, which forced the reduction of speed over derailment concerns.[4] Seventeen months later,[4] the AtlalilcoTláhuac section, where Tezonco and Olivos stations are located, was closed for 20 months to give way for repairs of technical and structural faults.[11]

A special commission was created to investigate the causes and to hold officials accountable for the errors that caused the closure.[12] Independent consulting group SYSTRA was asked to submit a report on their investigation. After they reviewed over 2,900 documents and tested the tracks,[13] the group concluded that errors were present during the "planning, design, construction and operation" of the line.[14] In 2015, the Superior Audit Office of the Federation (Auditoría Superior de la Federación; ASF) determined that there were 12 irregularities during the construction process, including incompatibilities between the FE-10's train wheels and the rails, which could cause instabilities, and that the trains' operations were safe but at the acceptable limit.[15]

After the 2017 Puebla earthquake damaged Line 12 tracks, Olivos station was temporarily closed,[16] but it was later reopened and served as the provisional terminal station for one month.[17] Residents had reported in 2017 that the section had visible structural cracks that could cause a future collapse.[2][18] Transport authorities made repairs following these complaints.[2] A column between Olivos and Nopalera stations that showed cracks in its base was repaired by the transport authority by January 2018.[19][20] Before the COVID-19 pandemic, however, residents had informed the authorities that the stretch was steep and the girders were bent.[21]

Mexico City Metro viaduct collapse Background articles: 19


Concrete girders near Olivos station in 2010. The accident was caused by the collapse of a similar girder.
FE-10 No. 7 (in front), the train involved

On 3 May 2021 at 22:25 CDT, in the borough of Tláhuac,[22][23] an eastward-bound train was passing on the elevated viaduct between Olivos and Tezonco stations.[24] Around 220 meters (720 ft) before reaching Olivos station,[25] the section collapsed when a girder supporting the tracks failed,[26] causing the last two train cars[24] to fall.[7][27][28] The debris fell onto a car.[2][22] The overpass was about 5 metres (16 ft) above ground level but was situated above a concrete median strip, which minimized casualties among motorists on the road.[22]

At least 24 people died and 70 others were injured; 65 of the victims were hospitalized, of whom seven were described as in a serious condition.[22][29][30] The fatalities included children.[22]

Mexico City Metro viaduct collapse Collapse articles: 3

Rescue efforts

After the collapse, passersby began rescue efforts[21][31] and were later joined by first response teams.[32] One person was trapped in their vehicle by the train and was rescued and uninjured.[23] After a few hours, the rescue maneuvers were halted as the structure was unstable.[33] A crane was dispatched to hoist sections of the train while search and rescue teams worked to find survivors.[29]


Service on the entirety of Line 12 was suspended and replaced with buses.[34] STC warned residents to avoid the area.[1]

Mexico City Mayor Claudia Sheinbaum said that the Public Prosecutor's Office will be solely working on the investigation into the cause of the accident.[1] The line will remain closed while a structural survey is undertaken.[35]

The following day, protesters vandalized several stations.[36]

Overview of "Claudia Sheinbaum" article


  1. ^ a b c d e "Sube a 24 la cifra de muertos por el derrumbe del metro de Ciudad de México" [The death toll from the collapse of the Mexico City metro rises to 24]. swissinfo.ch (in Spanish). 4 May 2021. Retrieved 4 May 2021.
  2. ^ a b c d "Mexico City metro overpass collapse kills 23". BBC News. 4 May 2021. Retrieved 4 May 2021.
  3. ^ "Afluencia de estación por línea 2019" [Station traffic per line 2019] (in Spanish). Sistema de Transporte Colectivo Metro. 2020. Archived from the original on 8 April 2020. Retrieved 4 May 2021.
  4. ^ a b c d e f Lopez, Oscar; Ives, Mike; Taylor, Derrick Bryson (4 May 2021). "Mexico City's metro has been plagued by problems". The New York Times. Retrieved 4 May 2021.
  5. ^ "Anger mounts as death toll from Mexico metro overpass collapse rises to 24". The Guardian. 4 May 2021. Retrieved 4 May 2021.
  6. ^ Navarro, Israel; Alzaga, Ignacio (1 April 2021). "Choque del Metro Tacubaya, por falla humana; enjuiciarán a dos" [Tacubaya station crash caused by human error; two to be prosecuted]. Milenio (in Spanish). Mexico City.
  7. ^ a b Sheridan, Mary Beth (4 May 2021). "Mexico City subway overpass collapses; at least 13 dead as metro cars topple". The Washington Post. Retrieved 4 May 2021.
  8. ^ Castillejos, Jessica (21 September 2008). "Línea 12 arranca construcción a vapor" [Line 12 starts with steaming construction]. Excélsior (in Spanish). Archived from the original on 9 December 2008. Retrieved 4 May 2021.
  9. ^ "¿Quién construyó la línea 12 del Metro?" [Who built Line 12?]. Expansión (in Spanish). 11 March 2014. Archived from the original on 2 July 2020. Retrieved 4 May 2021.
  10. ^ "FCH: Línea 12, esfuerzo de voluntades; reconoce a Ebrard" [FCH: Line 12, effort of wills; recognizes Ebrard]. El Universal (in Spanish). 30 October 2012. Retrieved 27 July 2018.
  11. ^ Rodea, Felipe (29 November 2015). "Mancera reabre Línea 12 del Metro" [Mancera reopens Metro's Line 12]. El Financiero (in Spanish). Archived from the original on 4 July 2020. Retrieved 3 May 2021.
  12. ^ Ramírez, Kenya (18 March 2014). "Lista la Comisión Investigadora de la Línea 12 en la ALDF" [Line 12 Investigation Commission in the ALDF is ready]. Excélsior (in Spanish). Retrieved 4 May 2021.
  13. ^ "Línea 12 del Metro falló en diseño y construcción" [Metro Line 12 failed in design and construction]. Forbes (in Spanish). 5 September 2014. Retrieved 4 May 2021.
  14. ^ "Cronología y fechas clave en la Línea 12 del Metro" [Chronology and key dates on Metro Line 12]. El Universal (in Spanish). Mexico City. 4 May 2021. Retrieved 4 May 2021.
  15. ^ González, Isabella (4 May 2021). "Las irregularidades de la Línea 12" [Line 12 irregularities]. LatinUS. Retrieved 4 May 2021.
  16. ^ Hernández, Eduardo (21 September 2017). "Vecinos temen colapso de Línea 12 del Metro por sismo" [Neighbors fear collapse of Metro Line 12 due to earthquake]. El Universal (in Spanish). Mexico City. Retrieved 4 May 2021.
  17. ^ "Metro reabre tramo dañado de Línea 12" [Metro reopens the damaged section of Line 12]. El Heraldo de México (in Spanish). 30 October 2017. Archived from the original on 3 March 2018. Retrieved 4 May 2021.
  18. ^ "Vecinos temían colapso de la Línea 12, según video de El Universal de 2017" [Neighbors feared Line 12 collapse, according to a El Universal video from 2017]. Aristegui Noticias (in Spanish). 3 May 2021. Retrieved 4 May 2021.
  19. ^ "Vecinos de la Línea 12 alertaron por grietas... en 2017" [Line 12 neighbors warned about cracks... in 2017]. Chilango (in Spanish). 4 May 2021. Retrieved 4 May 2021.
  20. ^ Sistema de Transporte Colectivo [@MetroCDMX] (9 January 2018). "Se concluyeron los trabajos de reforzamiento realizados en la Columna 69 entre #Olivos y #Nopalera de #L12" [Reinforcement works carried out on Column 69 between #Olivos and #Nopalera of #L12 were concluded.] (Tweet) (in Spanish). Archived from the original on 4 May 2021. Retrieved 4 May 2021 – via Twitter.
  21. ^ a b Fuentes, David (4 May 2021). "Otra vez brota la solidaridad de extraños por accidente en Línea 12 del Metro" [Once again, solidarity from strangers in the aftermath of the accident on Metro Line 12]. El Universal. Retrieved 4 May 2021.
  22. ^ a b c d e Castillo, E. Eduardo (4 May 2021). "Mexico City metro overpass collapses onto road; 23 dead". AP News.
  23. ^ a b Suarez, Karol; Paget, Sharif; Westcott, Ben (4 May 2021). "Mexico City subway overpass collapses, killing at least 23 and injuring dozens". CNN. Retrieved 4 May 2021.
  24. ^ a b Núñez, Jaime (4 May 2021). "Tragedia en el Metro". Telediario (in Spanish). Event occurs at 15:00 CDT. Multimedios Televisión. XHTDMX-TDT.
  25. ^ "Qué provocó la tragedia en la Línea 12: estas serían las causas del desplome de un tramo del Metro de la CDMX" [What caused the tragedy on Line 12: these could be the causes of the collapse of a section of the CDMX subway system]. Infobae (in Spanish). 4 May 2021. Retrieved 4 May 2021.
  26. ^ Andrew Herrera, Karina (3 May 2021). "Se desploma 'ballena' con trenes del Metro CDMX en la estación Olivos de la Línea 12" [A 'whale' collapses with CDMX Metro cars at Olivos station on Line 12]. Noticieros Televisa (in Spanish). Retrieved 3 May 2021.
  27. ^ Ives, Mike (4 May 2021). "Subway Train Derails in Mexico City, Killing at Least 13". The New York Times. Retrieved 4 May 2021.
  28. ^ "Puente del Metro cae en estaciones Olivos y Tezonco de la Línea 12" [Structure on Line 12 of the CdMx Metro collapses and train falls]. Milenio (in Spanish). 3 May 2021. Retrieved 4 May 2021.
  29. ^ a b "Mexico City rail overpass collapses, killing 20 people". Reuters. 4 May 2021. Retrieved 4 May 2021.
  30. ^ "Colapsa estructura en la Línea 12 del Metro; se registran seis muertos" [Structure collapses on Metro Line 12; six dead are registered]. Energía Hoy (in Spanish). 3 May 2021. Retrieved 3 May 2021.
  31. ^ "Puente se desploma con todo y tren del Metro en estación Olivos de la L12, en la CDMX" [Bridge collapses with a Metro train at Olivos station of L12, in Mexico City]. Diario de Colima (in Spanish). 3 May 2021.
  32. ^ "Survivors Helped From Wreckage After Deadly Mexico City Overpass Collapse". Yahoo!. 4 May 2021. Retrieved 4 May 2021.
  33. ^ "Claudia Sheinbaum informa suspensión en maniobras de rescate; 'estructura está muy débil'" [Claudia Sheinbaum reports suspension of rescue maneuvers; 'structure is too weak']. El Heraldo de México (in Spanish). 4 May 2021. Retrieved 4 May 2021.
  34. ^ "Cierran toda la Línea 12 del Metro; RTP brindará servicio de apoyo" [All Metro Line 12 is closed; RTP will provide back-up service]. Chilango (in Spanish). 4 May 2021. Retrieved 4 May 2021.
  35. ^ "Mexico City metro overpass collapse kills 23". BBC News. 4 May 2021. Retrieved 4 May 2021.
  36. ^ "Feministas y encapuchados protestan por accidente en el Metro CDMX" [Feminists and hooded demonstrator protest accident in the CDMX Metro]. Azteca Noticias (in Spanish). 4 May 2021. Retrieved 4 May 2021.