reconfigured to improve reliability in the subway. T Third Street and M Ocean View light rail lines were interlined, running between Sunnydale station and Balboa Park station. Light rail service was re-replaced with buses on August 25 due to issues with malfunctioning overhead wire splices and the need to quarantine control center staff after a COVID-19 case. Rail service resumed on the Embarcadero–Sunnydale section of the T Third Street line on January 23, 2021. In preparation for the return of rail service, several temporary changes were made at the 4th Street bridge over China Basin: one southbound lane became a transit-only lane, and a northbound turn lane at Berry (which shared space with the tracks) was removed. This change was found to decrease delays at the bridge by 60%. Service was re-extended to West Portal on May 15, again through-routed with the K Ingleside. Central Subway The second phase of the line was built as the Central Subway, which forms a crosstown link between South of Market (SoMa) and Chinatown via Union Square. Voters approved the Central Subway in 2003, and the alignment was selected in 2008. Construction began in 2012. After numerous delays, the Central Subway opened on November 19, 2022, with a weekend-only shuttle service operating between and . The T Third Street was rerouted to travel through the Central Subway for full service on January 7, 2023. Service runs every 10 minutes on weekdays and every 12 minutes on weekends. Shuttle trains signed "S Chase Center" operate between Chinatown and for events at Chase Center. Station listing All stations along this line feature high platforms, eliminating the need for the raising and lowering of entrance and exit steps characteristic of other Muni Metro lines. References External links SFMTA - K Ingleside/T Third Street Muni Metro lines 2007 establishments in California