section_path: Transportation/Los Angeles County Metro
section_name: Los Angeles County Metro
paragraph_text: Los Angeles County Metro
  
  The Los Angeles Metro Rail is the mass transit rail system of Los Angeles County. It is run by the Los Angeles County Metropolitan Transportation Authority and its system runs six rail lines throughout Los Angeles County. Metro Rail currently operates four light rail and two rapid transit lines, altogether totaling 115.5 miles (185.9 km) of rail, 101 stations, and over 360,000 daily weekday boardings as of December 2012.
  
  The system's light rail lines are the second busiest LRT system in the United States, after Boston, by number of riders, with 200,300 average weekday boardings during the third quarter of 2012. By 2019, it had become the most heavily ridden light rail system in the country.
  
  Since the region of the city is in close proximity to a major fault area the tunnels were built to resist earthquakes of up to magnitude 7.5. Both subway lines use an electrified third rail to provide power to the trains, rendering these lines unusable on the other three. The Blue and Gold Lines run mostly at grade, with some street-running, elevated, and underground stretches in the more densely populated areas of Los Angeles. The Green Line is entirely grade separated, running in the median of I-105 and then turning southward along an elevated route.
  
  The rail lines run regularly from roughly 4:00 AM to 1:00 AM, seven days a week.