The Sarmiento Line, on which the incident occurred, was operated by Trenes de Buenos Aires (TBA), owned by the Cirigliano brothers.

[4] Train number 16 was operating the Sarmiento Line local service 3772 from Moreno to Once during the morning rush hour on the first working day after a Carnival holiday.

[10] Several ambulances were in the area at the time of the accident, waiting for a ship that had suffered an influenza B outbreak, and were used to transport victims to nearby hospitals.

[12] Argentine President Cristina Fernández de Kirchner declared two days of national mourning and suspended the Carnival festivities.

[14] Minister of Planning and Public Investment Julio de Vido announced that the presidency would initiate a lawsuit against TBA, the owners of the Sarmiento line,[15] but that was not accepted by the Justice Department, arguing that government officials could also have broad responsibilities in the accident.

[19] The Foreign and Commonwealth Office of the United Kingdom regretted the incident and expressed its condolences to the "families of the victims" and the "emergency agencies that are still working to aid" those in the accident.

[20] The Secretariat of Foreign Affairs of Mexico sent its condolences to the "sister country of Argentina" and hoped for the "speedy recovery of the families and those injured.

[10] The driver, 28-year-old Marcos Antonio Córdoba, was taken into custody but later released by the investigating judge over the objections of the prosecutor after declaring under oath "I tried to brake twice, but the mechanism failed."

[1] A judicial source said Cordoba told investigators: "At each station he advised the dispatcher by radio that he had problems with the brakes."

Among the most relevant acts is the court's decision to reject the conclusions of four of the six experts (engineers Horacio Faggiani, Julio César Pastine, Alejandro Héctor Leonetti and Raúl Díaz) and request that they be prosecuted for false testimony, which Judge Bonadío did.

Juan Pablo Schiavi, former Secretary of Transportation, was sentenced to eight years in prison and a lifelong ban on public office.