It is operated by the Sistema de Transporte Colectivo Metrorrey, which is part of the decentralized public administration of Nuevo León.

As of 2024, the system operates 50 high-floor electric trains along 3 lines, serving 40 stations with a route of 40 kilometers (25 mi).

[1] Line 1 opened on April 25 of 1991[3] and has 19 stations, it runs through the center of the city from the north-west to the eastern part of the Monterrey metropolitan area.

[3] The second phase added another 5.3 km (3.3 mi) of elevated railway along the center of the Universidad avenue and 4 more stations, it was inaugurated on October 9 of 2008[3] by Nuevo León Governor Natividad González Parás and Mexican president Felipe Calderón.

[9][10] Construction of Line 3 started in 2013[1] and was completed by January 2020, but the rolling stock had not been delivered; at that time, the estimated delivery for twenty-six rail cars was December 2020.

[11] It was eventually inaugurated on February 27, 2021[1] by Nuevo León Governor Jaime Rodríguez Calderón.

It utilizes high-floor light rail vehicles, similar to light rail systems, while also operating on a fully grade separated exclusive right-of-way with high passenger volumes, similar to a metro system.

[4] Five manufacturers have provided rolling stock for Metrorrey, these being Concarril (MM-90A),[7] Bombardier (MM-90B and MM-05),[7] CAF (MM-93), Duewag-Talbot (MM-U3),[9] and CRRC (MM-20 and MM-24).

[18] Throughout his campaign and in the first months of his term, Governor Samuel García pledged to substantially expand the Metrorrey network during his tenure.

The 13.5 km (8.4 mi)-long Line 4 will connect the Western suburb of Santa Catarina with Downtown Monterrey, while Line 5 will follow a southern route towards the Carretera Nacional area, with an estimated route of 8.5 km (5.3 mi).

[19] García furthermore announced that the new lines will predominantly run on an elevated viaduct, which caused some backlash among neighbors in South Monterrey, with calls for an underground system.

At 18.5 km (11.5 mi) long, it is expected to become the longest route in the system, connecting Downtown Monterrey with the suburb of Apodaca.