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Earlier this month, Metro ended ties with contractor Constructora Metro 6, a joint venture between Italian firms Salini and Impregilo that was in charge of the construction of tunnels and civil works on two stretches of the new line, claiming the company did not fulfill the terms of the agreement.
"In order to start operating line 6 in the expected timeframe, pending works will be awarded to contractors currently working on metro lines 6 and 3," Metro CEO Rubén Alvarado said in a letter sent to regulators.
Line 6 is a US$1.06bn project that will run 15.3km across the capital from central-east Providencia to Cerrillos in the west. It will have 10 stations serving 870,000 residents.
Metro is also building the 22km line No 3, a US$1.72bn project with 18 stations between Ñuñoa in eastern Santiago and Huechuraba in the north of the capital.