Operation

The J Church begins service at 5 am on weekdays and 6 am on weekends, and runs until midnight. Daytime headways are every 15 minutes; nights and weekend mornings are every 20 minutes. Unlike the other Muni Metro lines, there is not a corresponding overnight Owl bus during the hours that rail service is not running.

Extension to Balboa Park

An outbound J Church car turns from 30th Street onto San Jose Avenue in 1993, two months after the start of all-day service on the extension south of 30th.

The outer end of the line was originally at Church and 30th Streets, where streetcars used a wye to turn around. Studies to extend the line from its southern terminus had been made in the 1920s^[4] and 1970's.^[9] In 1990–91, the tracks were extended to the Balboa Park BART station and the Metro Center (Muni light-rail maintenance and operations base), giving J-line cars a much shorter connection to the yard than previously. The extension opened on August 31, 1991, but the 2.3-mile (3.7 km) new section was initially used only by light rail cars starting or ending their runs;^[10] all-day J-line service was not extended along the new tracks until June 19, 1993.^[11][12]

This trackage was laid along the Bernal Cut, the former right-of-way of the San Francisco & San Jose Railroad.^[4]

This extension of the J-line to the Metro Center now also provides vintage F Market cars a connection to the adjacent Cameron Beach Yard, where they are stored when not in service. Occasionally J-Church streetcars use the siding at 30th and Church as a terminus during rush hours, or during irregular operations.

The 19th Avenue Platform & Trackway Improvement Project originally included pocket tracks to allow J Church trains to continue past Balboa Park with service to Stonestown. Due to community backlash, the compromise plan did not include the facilities necessary to run joint J-M service.^[6]

Later changes

An outbound train switching back towards Balboa Park Station from the Duboce terminal in December 2020

In March 2014, Muni released details of the proposed implementation of their Transit Effectiveness Project (later rebranded MuniForward), which included a variety of changes for the J Church line intended to improve reliability and decrease travel times. The proposed changes included the removal of two stops (Liberty and Church and 30th Street), minor relocations of several other stops, construction of boarding islands and transit bulbs, and transit-only lanes on three blocks of Church Street, plus an increase in frequency from 9.5-minute headways to 8-minute headways during the morning peak.^[13] One element – dedicated transit/taxi lanes and left turn restrictions on Church Street between Duboce Avenue and 16th Street – was chosen for implementation as a pilot project to test its effectiveness. The red-painted dedicated center lanes (for use also by the 22-Fillmore bus) and turn restrictions were added in March 2013. The project proved to reduce travel time and improve reliability on both rail and bus, while not significantly increasing travel time in private automobiles.^[14]The SFMTA Board made the changes permanent in June 2015.^[15]

The line was temporarily through-routed with the surface section of the K Ingleside line from June 25 to August 24, 2018, due to the Twin Peaks Tunnel shutdown.^[16] In November 2019, the SFMTA announced plans for near-term changes including the closure of the Church and 30th Street stop will be closed and the addition of a traffic signal at Cesar Chavez Street. A pilot program was also to use a surface turnback on The Embarcadero in an effort to reduce terminal delays at Embarcadero station.^[17]

On March 30, 2020, Muni Metro service was replaced with buses due to the COVID-19 pandemic.^[18] Rail service returned on August 22, 2020, with the routes reconfigured to improve reliability in the subway. J Church service ran only on the surface.^[19] The J initially terminated at the inbound platform on Church Street at Market Street, requiring passengers to transfer between the J and subway trains.^[20] A mini-high platform was to be constructed on the inbound platform at Church and Duboce, and an outbound mini-high platform will be built on Church Street south of Market Street, which was to allow the J to be re-extended slightly to Duboce Street (with additional transfer to the N Judah) in October 2020.^[20] The forced transfer at Church station, which required J Church riders to cross two streets and use two elevators to transfer, was criticized by disability advocates and others.^[21]

Rail service was again 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.^[22] J Church service on the surface-only Balboa Park–Church and Duboce routing resumed on December 19, 2020, while full service to Embarcadero station was restored on February 19, 2022.^[23][24]

Future plans

The SFMTA resumed planning for the Muni Forward project, the J Church Safety and Accessibility Project, in 2022.^[25] Changes on the San Jose Avenue portion of the line were approved in October 2023.^[26] These include transit-only lanes between Ocean Avenue and Cotter Street, platform extensions and accessible mini-high platforms at two stops, and pedestrian safety changes at several intersections. Some changes will be implemented in a "quick-build" phase in late 2023 and early 2024, while most construction will take place in 2025–2027.^[25]

In December 2021, the SFMTA indicated a possible use of historic street cars to provide a one-seat service on the J Church to Embarcadero using existing surface tracks on Market Street as a future alternative to running the J Church in the subway tunnel.^[27]