On January 22 , 2019 , Line 3 was inaugurated , after 9 years of prospecting and construction and being delayed since the 1980s after the 1985 Algarrobo earthquake and the changing demographics of the city during the '80s and '90s . Its rolling stock material is identical to the Line 3 and were built simultaneously , so they 're considered " twin lines "
1985 Algarrobo earthquake
1985 Algarrobo earthquake
Santiago Metro