Originally Posted by Antje
It is going well, but I feel tempted to suggest sending Line 4A around Highway 70 and into Line 4 at Tobalaba to create an orbital route and reduce pressure on the central sections. Paris is doing something similar with the Grand Paris Express.
I think that many users from the Chilean forum have proposed something like that. It's not clear if Metro would build that extension sometime in a near future, but in the meantime there's a proposal for extending Line 4A to the eastern (along Highway 70 [Américo Vespucio avenue]) from La Cisterna station (existing transfer with Line 2) to Lo Espejo (one of the only 3 communes of Santiago that doesn't have a Metro line inside their limits; the others being Huechuraba and Lo Barnechea) and making a transfer with "Metrotren Melipilla" (a new suburban rail service that will begin construction the next year), but many claim that this extension could extend even further and reach Del Sol station (transfer with Line 5 in Maipú).
The proposed extension of Line 4A is marked in turquoise on this map:
Lo Barnechea (other of the communes that doesn't have Metro) are planning to carry studies along with the municipalities of Las Condes and Vitacura to extend Line 7 (that will open in 2026) to La Dehesa, a wealthy neighbourhood of Lo Barnechea.
The proposed extension of Line 7 is marked in white on this map: