In 2007 an intermediate station called Pinar del Rey opened between Colombia and Mar de Cristal, as did an extension to the new Terminal 4 of Madrid Airport.

As part of network extension plans in the 1970s, the construction of a north–south line along the Castellana-Recoletos-Prado axis originating in Fuencarral and headed toward Madrid Atocha and further to the south was initiated.

From this project the construction of the section between Fuencarral and Nuevos Ministerios which opened on 9 June 1982 on the occasion of the celebration of the World Cup in Spain began, as the line gave service to Santiago Bernabéu Stadium.

This way, on Tuesday 23 December 1986, the extension of line 8 from Nuevos Ministerios and Americas Avenue was opened.

To make this possible, it was necessary to install the platforms projections because, since then, the stretch began to exploit narrow gauge trains.