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Santiago Metro Line 4A is one of the seven lines that currently make up the Santiago Metro network in Santiago, Chile. It has six stations and 7.7 km (4.8 mi) of track. The line intersects with Line 2 at La Cisterna, and with Line 4 at Vicuña Mackenna, both being its termini. It will also intersect with the future Line 9 at Santa Rosa station and acts as a link between these two lines. Its distinctive colour on the network line map is light blue.
 | This article relies largely or entirely on a single source. (January 2023) |
| Santiago Metro Line 4A | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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 The rail line south of its northeastern terminal | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Overview | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Status | Operational | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Owner | Empresa de Transporte de Pasajeros Metro S.A. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Locale | Santiago | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Termini | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Stations | 6 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Service | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Type | Rapid transit | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| System | Santiago Metro | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Services | 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Operator(s) | Empresa de Transporte de Pasajeros Metro S.A. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Depot(s) | none (shares stock with line 4) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Rolling stock | Alstom AS 2002 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Daily ridership | 56,400 (2015) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| History | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Opened | August 16, 2006 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Technical | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line length | 7.7 km (4.8 mi) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Number of tracks | 2 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Character | Open-cut and underground | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) standard gauge | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Electrification | 750 V DC third rail | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Operating speed | 80 km/h (50 mph) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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In 2015, Line 4A accounted for only 3.1% of all trips made on the metro system with a daily ridership of 56,400; it is the least used line in the system since it does not serve the city centre, as well as being the shortest line in the system.
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.[1] The strike caused major over-crowding on bus services as passengers used them as an alternative to their daily metro rides.
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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.
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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.
| Stations | Transfers | Location | Opening | Commune | Notes |
|---|---|---|---|---|---|
| Vicuña Mackenna |  |
Autopista Vespucio Sur esq. Julio Vildosola | La Florida | ||
| Santa Julia | Autopista Vespucio Sur/Santa Julia | La Florida | |||
| La Granja | Autopista Vespucio Sur/Coronel | La Granja | |||
| Santa Rosa | Autopista Vespucio Sur/Av. Santa Rosa | La Granja/San Ramón | This station will be future combination with the line  in 2030. | ||
| San Ramón | Autopista Vespucio Sur/Av. La Bandera | San Ramón | |||
| La Cisterna |   |
Autopista Vespucio Sur/Av. José Miguel Carrera | La Cisterna |
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