\r\nThe contract covers a total of 90 single track-km on Lines 3 and 6, including 15km of track in depots. The consortium will maintain the track and catenary for a period of 20 years.\r\nLine 3 will run for 22km from the northern district of Huechuraba to the city centre, where it will follow Avienda Mattam passing beneath Irarraz\u00e1val, before terminating at Larra\u00edn. The line will have 18 stations, including six interchanges with other lines, and will cost around $US 1.72bn to construct. Commissioning is scheduled for June 2018.\r\nLine 6 will be 15.3km long with 10 stations, and will connect Pedro Aguirre Cerda in the west with Los Leones on Line 1, intersecting Line 3 at Carmelitas. The $US 1.03bn line will open in February 2017.