When the agency in charge of the underground (STC) was created in 1967, the federal government funded its expansion and operational subsidy. After the 1997 reform, the government of the Federal District assumed responsibility for the underground system (Medina, 2013).32 As a consequence, under the current framework, the Federal District has to provide the operational subsidy for the underground in the State of Mexico, and is also responsible for the maintenance and management of this infrastructure (Medina, 2013). This is far from ideal, since better connections for population in the State of Mexico necessarily mean higher financial pressure for the Federal District, which is already operating the underground at a deficit.