[2] In 2009, the then mayor of Tlajomulco,Enrique Alfaro Ramírez, proposed a failed project for a Line 3 of the Guadalajara light rail to the Jalisco State Congress; however it was rejected by partisan majority.

With this project it was intended to benefit to more than 700,000 people, as the zones where the line would be built on suffer from a strong recession in public transport matters.

[6][7] After both candidates resulted elected, a López Obrador spokesman announced the Isla Raza to Santa Fe project,[8] route that had been proposed and analysed years before during the Emilio González Márquez administration.

In a meeting with the Mexican president, Andrés Manuel López Obrador, the Jalisco governor, Enrique Alfaro, affirmed that the Line 4 already had the technical studies for its construction and assured that the preliminary works would begin in October 2021.

It will connect with the Fray Angélico bus station in the terminal of Mi Macro Calzada through a multimodal transfer centre (CETRAM), and will run on the railway right of way Guadalajara-Manzanillo.