Juanacatlán, Tacubaya, and Observatorio, Chapultepec, Sevilla, Insurgentes, Cuauhtémoc, Balderas, and Salto del Agua stations are currently closed for reconstruction through September 2024.

[2] The first section of Line 1 was opened on 4 September 1969 as part of Mexico City Metro's first construction stage, it was inaugurated by Gustavo Díaz Ordaz, President of Mexico from 1964 to 1970, and Alfonso Corona del Rosal, Regent of the Federal District Department.

The two westernmost stations Tacubaya and current terminal Observatorio were inaugurated on 20 November 1970 and 10 June 1972 respectively.

Station Pantitlán was opened on 22 August 1984 as the eastern terminal during a fourth and final expansion.

The first closure was from Pantitlán to Salto de Agua stations starting on 11 July 2022 and it was expected to conclude in March 2023.

During both periods, all railway elements will be replaced with modern material, the wiring will be replaced, damage due to leaks and cracks will be repaired, stations that are not yet modernized will be updated, and accessibility will be added to stations that lack it.