Line 4A was originally conceived as a branch of Line 4, but due to the considerably low demand compared to the Puente Alto service, it was separated from Line 4 and inaugurated as a different service. It was inaugurated by President
Michelle Bachelet and opened to the public on August 16, 2006. It runs between
La Cisterna station and
Vicuña Mackenna station. On November 29, 2010
Santiago Metro workers struck, halting the service for 17 days. The strike caused major over-crowding on bus services as passengers used them as an alternative to their daily metro rides.
Echeverría: The Ghost Station Echeverría metro station, built but never opened to the public, is located between
La Cisterna station and
San Ramón station on the junction of Blas Vial street and Maria Vial in the
commune of
La Cisterna. The station remains partially built, with the platforms and footbridge across the highway already finished. The station has never been completed due to the low density of residents in this area, although it could be finished and opened to the public if the population density increased.
Extensions The line may be extended in the future to
Del Sol station to connect with
Line 5. The trench where the extension would run has already been built between the two lanes of the Autopista Vespucio Sur highway, ready for the extension to be laid down if the population were to increase in that part of the city. If built, the extension would serve the
communes of
La Cisterna,
Lo Espejo,
Cerrillos and
Maipú. During his last public address, on June 1, 2025, President
Gabriel Boric announced the extension of Line 4A to the municipalities of Lo Espejo, Cerrillos and Maipú, connecting with the Del Sol on Line 5; at the same time, it was announced that the line would change its name to Line 10 and the existing stations would be remodeled. The extension entails 10 more kilometers and 7 new stations that would be delivered no earlier than 2037. ==Stations==