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 L Line, which opened on November 15, 2009. Operations Maintenance The B Line operates out of the Division 20 Yard (Santa Fe Yard), located at 320 South Santa Fe Avenue in Downtown Los Angeles. This yard stores the fleet used on the B and D Lines, and where heavy maintenance is performed. Cars reach this yard by continuing past Union Station, making a right turn and surfacing at the Eastern terminus of Ducommun Street. They then travel south to 1st Street, through a washing station, and enter the yard. Rolling stock The B Line uses A650 electric multiple unit cars built by Breda in Italy. Trains usually run in six-car configurations during peak hours and four-car configurations otherwise. The cars are maintained in a Metro yard on Santa Fe Avenue near 4th Street alongside the Los Angeles River in downtown Los Angeles. In March 2017, Metro ordered new CRRC HR4000 railcars, which will operate on the B Line when they are delivered. Potential future extensions Extension to Arts District In 2010, at the request of L.A. City Councilman Tom LaBonge, Metro staff studied the possibility of adding a station along the west bank of the Los Angeles River to 6th Street and Santa Fe Avenue. The study concluded that such an extension, completed at-grade along Metro-owned right-of-way, could be completed for as little as $90 million. The study suggested an alternative station at the Division 20 Yard north of 4th Street and Santa Fe Avenue. This station would be closer to the residential population of the Arts District. As new turnback tracks will need to be built as part of the D Line Extension (to allow shorter headways), this Arts District extension could possibly be partially completed as part of the Purple Line Extension project, lowering the incremental cost of the station while increasing its usability. Extensions to the South One of the proposals for the Vermont Transit Corridor being considered by Metro would extend a subway line from Wilshire/Vermont station down Vermont Avenue to 120th Street. Metro is also considering other types of mass transit for the line, including light rail and busway options. Incidents On December 22, 2006, a rider accidentally spilled a vial of mercury on the platform at the Pershing Square