According to BN Americas, Chile's EFE (Empresa de los Ferrocarriles del Estado - State Railway Company) updates its plans to take underground the 3.5km of 61km Melipilla-Santiago railway. The underground section will be between Santiago's Estación Central 2 and Alameda stations.
https://www.bnamericas.com/en/news/chile-adds-underground-line-to-us155bn-rail-project
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https://www.bnamericas.com/en/news/chile-adds-underground-line-to-us155bn-rail-project
BNamericas - Chile adds underground line to US$1.55bn rai...
www.bnamericas.comThe change will cost US$250mn and involves a 3.5km section of the Melipilla-Santiago line, on which construction began in August.