[3] The Mexican Federal Competition Commission (CFC) had rejected a proposed 2002 merger of Ferromex and Ferrosur amid opposition from Grupo Transportación Ferroviaria Mexicana (TFM).

[7] In May 2023, the Mexican Armed Forces occupied a portion of 127 kilometres (79 mi) of railways in Veracruz belonging to Ferrosur so that they could be used for the Interoceanic Corridor of the Isthmus of Tehuantepec, one of the government's most important megaprojects.

[8] Mexican President Andrés Manuel López Obrador said that occurred "to avoid the risk of a future privatization of the railways and as a matter of national security and public interest.

[15][16] However, López Obrador stated in a morning press conference on May 24 that sought to reach an agreement with Ferrosur not involving financial compensation.

[17] An agreement was ultimately reached on the night of May 31 by which, as López Obrador had intended, the concession granted to Ferrosur in 1998 for the railways, which included the occupied sections, was extended by eight years and so it remains in force until 2056.