Santiago Metro has six operating lines (1, 2, 3, 4, 4A, 5 and 6), extending over  and connecting 118 stations. The system carries around 2,400,000 passengers per day. Two underground lines (Line 4 and 4A) and an extension of Line 2 were inaugurated in 2005 and 2006, while an extension of Line 5 was inaugurated in 2011. Line 6 was inaugurated in 2017, adding 10 stations to the network and approximately  of track. Line 3 opened on January 22, 2019 with 18 new stations 