[1] In early 2018, the state of Nuevo León signed a funding agreement to provide 600 million pesos to Metrorrey for continued construction on Line 3.

Up to that period, Metrorrey reported total expenditures on Line 3 of over 10 billion pesos.

The transit agency claims it spent these funds for viaducts, and station features, such as awnings, elevators, and escalators.

[2] By January 2020, construction for Line 3 was complete, according to the Secretaría de Comunicaciones y Transportes (SCT), the federal transportation agency.

At that time, the estimated delivery for twenty-six rail cars was December 2020.