The current B Line is the product of a long-term plan to connect
Downtown Los Angeles to central and western portions of the city with a subway system. Original proposals in the 1980s had it running down
Wilshire Boulevard to
Fairfax Avenue and then north to the
San Fernando Valley. Residents in some parts of the city bitterly opposed the subway. A 1985 methane explosion at a
Ross Dress for Less clothing store near Fairfax gave Rep.
Henry Waxman, who represented the Fairfax District, a reason to derail the project that was opposed by his constituents by prohibiting tunnelling in an alleged "methane zone" west of Western on Wilshire. After some political wrangling, a new route was chosen up
Vermont Avenue to
Hollywood Boulevard. The groundbreaking for the first segment of the subway was held on September 29, 1986, on the site of the future
Civic Center/Grand Park station. Today's B Line was built in four
minimum operating segments: • MOS-1, consisting of five stations from
Union Station to , opened on January 30, 1993, as the Red Line. (At this point, the line's operator was still the
Southern California Rapid Transit District). • MOS-2A, consisting of three stations from to , opened on July 13, 1996, although only one station on this section () is on today's B Line. • MOS-2B, consisting of five stations from to , opened on June 12, 1999. • MOS-3, extending the Red Line from to , opened on June 24, 2000. Overall, the construction of the subway over the four phases cost $4.5 billion. Subway construction was delayed during the investigation and repairs of the sinkhole. The contractor on that segment project was replaced, and because of the perceived mismanagement of Red Line construction, in 1998 voters banned the use of existing sales taxes for subway tunnelling. Metro Red Line train at Union station in 2008 Construction of MOS-3, by comparison, proceeded with relatively few issues. Tunnelling from North Hollywood for the subway started in 1995. Workers dug under the
Santa Monica Mountains using tunnelling machines. Work progressed an average of daily, performed by work crews round-the-clock six days a week. Original proposals for the subway system included expansions east from Union Station to
East Los Angeles and west from North Hollywood towards the
Warner Center transit hub in the San Fernando Valley. Barred from subway tunnelling, Metro turned to other types of mass transit. In the San Fernando Valley, residents passed a law in 1991 mandating that any rail line in the area be built underground, so Metro built a busway (now the
G Line) from North Hollywood to Warner Center, which opened on October 29, 2005. East of Union Station, Metro built a light rail line with at-grade and underground segments to East Los Angeles, now part of the
E Line, which opened on November 15, 2009. In 2020, Metro renamed all of its lines using letters and colors, with the Red Line becoming the B Line (retaining the red color in its service bullet) and the Purple Line becoming the D Line. == Operations ==