Line 1 (Sistema de Tren Eléctrico Urbano)

Line 1 of the Guadalajara Urban Electric Train System opened on 1 September 1989. It is the oldest line of the Sistema de Tren Eléctrico Urbano (SITEUR), or Urban Electric Train System in Guadalajara. It was previously coloured blue, but after the stations were remodeled between 2014 and 2018 it is now red.

The construction of this line's road infrastructure began in 1974 and finished in 1976, with the intention of implementing a metropolitan and railway public transportation system in Guadalajara. This did not happen, as federal resources were diverted, which led to the building of electric trolleybus lines instead.

In 1982 an overpass was built at the intersection of Avenida Colón with the Calzada Lázaro Cárdenas and was completed in 1984 (for the extension of the Guadalajara trolleybus) towards Avenida Miguel López de Legaspi, and its pre-construction began in 1988, extending it from peripheral to peripheral, and it was completed in February 1989, to later be inaugurated in September of that same year. The inauguration was headed by the then-governor of Jalisco, Guillermo Cosío Vidaurri, and by the former president of Mexico, Carlos Salinas de Gortari.

In August 2014 the extension of line 1 to the north began, where the current terminal is located: the Auditorio station, located 1 km (0.62 mi) from the Periférico Norte station; the new station was opened on November 23, 2018. Line 1 links the municipalities of Zapopan, Guadalajara and Tlaquepaque from north to south through the Calzada Federalismo/Avenida Cristóbal Colón.