The Metro is a vital piece of infrastructure for Mexico City: it transports more then 4.5 million passengers on a daily basis. This program offers a look at the Metro as a system and as a microcosm, in which social relations and technology are enmeshed. It provides a trip through the system's history, up until the end of the 1960's, in order enter into contact with the human universe that populates it and organizes it twenty-four hours a day.—Clío TV