The line runs from Los Libertadores in the northern district of Huechuraba to the centre of Santiago, following Avienda Mattam and passing beneath Irarrazával, before terminating at Fernando Castillo Velasco in La Reina.
Line 3 is the city's second driverless metro line and serves 18 new stations, including interchanges with all other metro lines.
A consortium of CAF and Thales was awarded a $US 451.9m contract in November 2013 to supply rolling stock and CBTC for the lines 3 and 6. As part of the contract, CAF will maintain the fleet for 20 years in a deal worth $US 19.1m.
CAF has supplied 22 AS-2014 trains for Line 3. Each 120m-long five-car train accommodates 1299 passengers at 6p/m2.
In June 2018 Piñera announced plans to build two more metro lines in Santiago.
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