the first three-car train on Muni Metro since the 1990s. The three-car train and a two-car train ran between Embarcadero and St. Francis Circle station with only six morning round trips and one evening round trip; the last morning trips ran through to 23rd Street on their way to the Muni Metro East facility. However, the three-car set proved unreliable, and perennial rolling stock shortages caused the shuttles to be frequently cancelled in favor of branch line service. On November 7, 2016, Muni changed the service to a pair of single-car trains running between West Portal station and Embarcadero. The revamped service, which was modeled after similar Hillway shuttles on the N Judah line, ran during weekday morning rush hours. Although it nominally switched back at West Portal, service often instead used a more reliable crossover at Taraval and 19th Avenue station. By 2019, the SFMTA described the S Shuttle as an irregular route meant to supplement other Muni services. On March 30, 2020, Muni Metro service was replaced with buses due to the COVID-19 pandemic. Rail service returned on August 22, with the routes reconfigured to improve reliability in the subway. S Shuttle service frequency was increased, as three other lines no longer entered the subway; two- and three-car trains operated between West Portal and Embarcadero on 6–9 minute headways. 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. K/T and N subway service resumed on May 15, 2021, with S Shuttle service operated to supplement. Since T Third Street service moved to the Central Subway in January 2023, shuttle trains signed "S Chase Center" operate between and for events at Chase Center. Station listing References External links SFMTA – S Shuttle Muni Metro lines Castro District, San Francisco 2001 establishments in California