Santiago Metro Line 4  Santiago Metro Line 4 is one of the six lines that currently make up the Santiago Metro network in Santiago, Chile. It has 23 stations and 23.9 km of track. The line intersects with Line 1 at Tobalaba, with Line 3 at Plaza Egaña, with Line 4A at Vicuña Mackenna and with Line 5 at Vicente Valdés. It will also intersect with the future Line 8 at Macul. Its distinctive colour on the network line map is blue. As of now, it is the only line in the system to leave the Santiago Province, serving Puente Alto in the Cordillera Province. In 2015, Line 4 accounted for 18.1% of all trips made on the metro system with a ridership of 328,200. In October 2019, the line suspended operations as a result of the 2019 Santiago protests, however by now most of its stations have reopened. The first section of the new Line 4 was opened to the public on November 30, 2005 by President Ricardo Lagos Escobar running between Tobalaba station and Grecia station and between Vicente Valdés station - Plaza de Puente Alto station. The gap in the line between Grecia station and Vicente Valdés station was initially covered by Transantiago buses. Later, Los Presidentes station, Quilín station, Las Torres station, Macul station and Vicuña Mackenna station were opened to the public on March 2, 2006, connecting the first two sections. On December 9, 2007, an express service began to run on Line 4 at peak times, stopping at certain stations only to allow for faster journeys. On June 1, 2018 Chilean President Sebastián Piñera announced in the public account the extension of Line 4 to the sector of Bajos de Mena in Puente Alto that will be operational in 2026. In October 2019, as a result of the protests caused by the rise in the subway fare, major damage occurred throughout the metro network. Line 4 was the most heavily damaged line out of all the metro's services. The Los Quillayes, San José de la Estrella, Macul, Protectora de la Infancia, Trinidad and Elisa Correa stations were completely burned; the latter two stations suffered the worst amount of damage to their structures and tracks, which would prevent normal operation of Line 4 for a period lasting 10 to 12 months. Line 4 partially reopened between Tobalaba and Quilín stations on October 28.