The first option was to expand the viaduct of Line 1, from the Exhibition station, in Guadalupe, to Juárez and Cadereyta, via the free road to Reynosa.

The second option was to continue the work of Line 3, which at that time was under construction, from the Metropolitan Hospital, in San Nicolás, to the municipality of Apodaca, using the corridor of López Mateos Avenue.

[2] On 9 September 2022, the technical openings were completed as part of the process of the international public tender, two consortia were registered to win the award of the construction of Lines 4, 5 and 6.

[8] On 23 September 2022, the tender was awarded for the construction of lines 4, 5 and 6 of the Metro to the consortium formed by the Portuguese firm Mota-Engil de México and the Chinese CRRC Hong Kong.

The Secretary of Urban Mobility and Planning of Nuevo León Hernán Villarreal explained that the tender has two cost options and that both are profitable for the administration.

The consortium formed by Mota-Engil and CRRC will sign the contract on 26 September at 10:00, at the offices of the Legal Directorate of the Secretariat of Mobility and Urban Planning, located in the Administrative Tower.

Regarding the possibility of building part of the transport system at the street level, during the reading of the failure of the SMPU-LPI-001-2022 tender it was specified that this topic will be defined in November 2024.