San Francisco Municipal Railway
|Owner||San Francisco Municipal Transportation Agency|
|Transit type||Bus, trolleybus, light rail, streetcar, cable cars|
|Number of lines||83|
|Daily ridership||716,000[ citation needed]|
|Chief executive||Jeffrey Tumlin, Director of Transportation, SFMTA |
|Headquarters||One South Van Ness Avenue, Seventh Floor|
|Began operation||December 28, 1912 |
|Operator(s)||San Francisco Municipal Transportation Agency (SFMTA)|
|Track gauge||4 ft 8 1⁄2 in (1,435 mm)
standard gauge (light rail)|
3 ft 6 in (1,067 mm)
|Minimum radius of curvature||43 ft (13.106 m) |
|Electrification||Overhead lines, 600 V DC|
|Average speed||8.1 mph (13.0 km/h) |
|Top speed||varies |
In 2018, Muni served 46.7 square miles (121 km2) with an operating budget of about $1.2 billion.  In ridership terms, Muni is the seventh largest transit system in the United States, with 210,848,310 rides in 2006  and the second largest in California behind Metro in Los Angeles.
With a fleet average speed of 8.1 mph (13.0 km/h), it is the slowest major urban transit system in America and one of the most expensive to operate, costing $19.21 per mile per bus and $24.37 per mile per train.  However, it has more boardings per mile and more vehicles in operation than similar transit agencies. 
Muni is an integral part of public transit in the city of San Francisco, operating 365 days a year and connecting with regional transportation services, such as Bay Area Rapid Transit (BART), Caltrain, SamTrans, Golden Gate Transit, and AC Transit. Its network consists of 54 bus lines, 17 trolley bus lines, 7 light rail lines that operate above ground and in the city's lone subway tube (called Muni Metro), 3 cable car lines, and 2 heritage streetcar lines, the E Embarcadero and F Market. Many weekday riders are commuters, as the daytime weekday population in San Francisco exceeds its normal residential population. Muni shares four Metro stations with BART.
Most bus lines are scheduled to operate every five to fifteen minutes during peak hours, every five to twenty minutes middays, about every ten to twenty minutes from 9 pm to midnight, and roughly every half-hour for the late night "owl" routes. On weekends, most Muni bus lines are scheduled to run every ten to twenty minutes. However, complaints of unreliability, especially on less-often-served lines and older (pre-battery backup) trolleybus lines, are a system-wide problem. Muni has had some difficulty meeting a stated goal of 85% voter-demanded on-time service.  
All Muni lines run inside San Francisco city limits, with the exception of several lines serving locations in the northern part of neighboring Daly City, and the 76X Marin Headlands Express line to the Marin Headlands area on weekends and major holidays. Most intercity connections are provided by BART and Caltrain heavy rail, AC Transit buses at the Transbay Terminal, and Golden Gate Transit and SamTrans downtown.[ citation needed]
Bus and car stops throughout the city vary from Metro stations with raised platforms in the subway and at the more heavily used surface stops, to small shelters to signposts to simply a yellow stripe on a utility pole or on the road surface. 70% of stops are spaced closer than recommended range of 800–1,000 feet (240–300 m) apart. 
Muni is short for the "Municipal" in "San Francisco Municipal Railway" and is not an acronym; thus, when it is written in plain text, only Muni (not MUNI) is correct. The Muni metro is often called "the train" or "the streetcar." Most San Francisco natives use 'Muni' when speaking about the system (Metro & buses) in general.[ citation needed]
Bus and trolleybus lines have number designations, rail lines have letters and the three cable car lines are typically referred to by name only (Powell-Mason, Powell-Hyde and California).
Except for cable cars, cash fares are $3.00 for adults; $1.50 for seniors over 65, youth aged 5–18, people with disabilities, and Medicare card holders; and free for low- and moderate-income seniors, youth aged 5–18, people with disabilities residing in San Francisco, and up to three kids under 5 per adult.  Clipper card and MuniMobile fares are $2.50 for adults and $1.25 for seniors, youth, and people with disabilities. Proof-of-payment, which fare inspectors may demand at any time, is either a Clipper card, MuniMobile, Muni Passport, or paper transfer. One fare entitles a rider to unlimited vehicle transfers for the next 120 minutes.  [a] Cable cars are $8  one way, with no transfers, unless the rider has a Muni Passport or a Muni monthly pass. As of July 2019 monthly passes cost $81 for adults ($98 with BART privileges within city limits), $40 for low-income residents ("Life Line Pass"),  or $40 for youth, seniors and the disabled.  Passes are valid on all Muni lines—including cable cars—and the $98 adult pass allows BART transit entirely within San Francisco (between Embarcadero and Balboa Park). Other passes and stickers are valid on all Muni lines, including cable cars, but not on BART (with the exception of BART-Plus  ticket types).
Cable car fare is $8 per trip,  with no transfers issued or accepted. "Passports" are folding scratch-off passes that can be purchased by mail, or at various places throughout the city; they are good on all regular-service lines without surcharge, including cable cars. As of September 2018, Passports cost $23 for a 1-day pass, $34 for a 3-day pass, or $45 for a 7-day pass, with discounts for using Clipper card or MuniMobile. 
Muni has implemented a dual-mode smart card payment system known as Clipper (formerly TransLink). The transponders have been in use since at least 2004,  and replaced most paper monthly passes in 2010. BART, Caltrain, Golden Gate Transit, VTA, AC Transit, SamTrans, SMART and San Francisco Bay Ferry also utilize the Clipper system. 
Fares can also be paid with a mobile app called MuniMobile since 2015.  The app is developed by moovel,  who have built mobile ticketing apps for a number of other transit agencies such as Caltrain and TriMet. The app is planned to be deployed until around 2021 when the next generation Clipper card mobile app is planned to launch and replace agency-specific ticketing apps. 
|Year||Single ride||Adult monthly pass||Cable car fare|
|2020||$3, $2.50 with Clipper ||$98 with BART access, $81 without BART access ||$8 |
|2019||$2.75 increases to $3, $2.50 with Clipper  ||$94 increases to $98 with BART access,
$78 increases to $81 without BART access 
|2018||$2.75 ||$94 with BART access, $78 without BART access ||$7|
|2017||$2.50 increases to $2.75 ||$94 with BART access, $75 without BART access ||$7|
|2017||$2.25 increases to $2.50 ||$91 with BART access, $73 without BART access ||$7|
|2016||$2.25 ||$86 with BART access, $73 without BART access ||$7|
|2015||$2.25 ||$83 with BART access, $70 without BART access ||$6 increases to $7 |
|2014||$2 increases to $2.25 ||$80 with BART access, $68 without BART access ||$6 |
|2012||$2 ||$74 with BART access, $64 without BART access ||$6 |
|2011||$2 ||$72 with BART access, $62 without BART access ||$5 increases to $6 |
|2010||Usually $2, occasionally $2.25 for a single-use Clipper Card ||$70 with BART access, $60 without BART access ||$5 |
|2009||$2   ||$55  ||$5|
|2008||$1.50 ||$45 ||$5 |
|2006||$1.50  ||$45 ||$5  |
|2005||$1.25 increases to $1.50 ||$45  ||$5  |
|2003||$1 increases to $1.25  ||$45  ||$3  increases to $5 |
|2002||$1 ||$35 ||$2  |
|1999||$1  ||$35  ||$2 |
|1998||$1 ||$35   ||$2 |
|1993||$1  ||$35/$45 ||$2 each way  |
|1992||$0.85  increases to $1.00 ||$32 ||$3 round-trip  |
|1991||$0.85 ||$30 ||$2 |
|1988||$0.75 increases to $0.85  ||$28 ||$2   or $2.50 |
|1987||$0.75 ||$25 ||$1.50 |
|1986||$0.60 increases to $0.75  ||$23 ||$1 increases to $1.50  |
|1985||$0.60 ||$24 ||$1 |
|1984||$0.60 ||$20 ||$1 |
|1982||$0.50 increases to $0.60  ||$16  increases to $24 ||$1  |
|1981||$0.50 ||$16 ||$0.50 |
|1980||$0.25 increases to $0.50 ||$16 ||$0.25 |
|1979||$0.25 ||$11 ||$0.30 |
|1976||$0.25 ||$11 ||$0.25 |
|1975||$0.25 ||$11 ||$0.25 |
|1974||$0.25 ||Monthly passes introduced at $11 ||$0.25 |
|1970||$0.20 increases to $0.25  ||$0.25 |
|1969||$0.15   increases to $0.20  ||$0.25 |
|1961||$0.15 ||$0.05 |
|1952||$0.10 increases to $0.15   or $0.10 ||$0.05  or $0.10 |
|1951||$0.10 ||$0.05 |
|1950||$0.10 ||$0.05 |
|1949||$0.10  ||$0.05 |
|1947||$0.10 per ride, or $0.25 for three tokens ||$0.05 |
|1946||$0.07 increases to $0.10 ||$0.05  or $0.07 |
|1945||$0.07 ||$0.05  or $0.07 |
|1944||$0.05 increases to $0.07 ||$0.05  or $0.07 |
|1937||$0.05 ||$0.05 |
|1932||$0.05 ||$0.05 |
|1912||$0.05  (equivalent to $1.32 in 2019)||$0.05 |
Muni operates 14 express lines, 5 Rapid lines, and 12 Owl lines, which run between 1 am and 5 am. For San Francisco Giants games, additional "baseball shuttles" supplement N Judah and T Third service to Oracle Park. 
Express lines only run during peak hours; during mornings they run towards downtown (the Financial District) and during the evening they run away from downtown. All express lines have an "X", "AX", or "BX" following the line's number. Some lines are divided into A and B Expresses. The B Express line is shorter and has stops that are closer to downtown, while the A Express makes stops further away from downtown and will make few or no stops in the area where the B Express stops. The 8 Bayshore, as the 8X Bayshore Express, was the only Express route that ran daily until April 25, 2015, the date where it is no longer an Express route.
Rapid lines (having an R following their route number) stop at only a subset of the stops of their corresponding "standard" line—typically every third stop and at transfer points.
Muni also operates the San Francisco cable car system, a heritage streetcar system descendent of a larger network of manually operated cable cars. The first city-owned line was acquired in 1906, although the current configuration is an amalgamation of several former lines and has operated as such since in 1952. The system was designated a National Historic Landmark in 1964 and placed on the National Register of Historic Places in 1966.
Additionally, Muni operates two heritage streetcar lines distinct from the Muni Metro: the E Embarcadero and F Market & Wharves. Formerly run for the Historic Trolley Festival, in the 1980s, regular service of heritage equipment began in 1995. Streetcars do not utilize tunnel segments and the F line utilizes infrastructure optimized for trolleybuses along Market Street (the former routing of all downtown streetcar lines before the formation of Muni Metro).
Muni operates about 1,000 vehicles: diesel, electric, and hybrid electric transit buses, light rail vehicles, streetcars, historic streetcars, and cable cars. Many buses are diesel-powered, but more than 300 are zero emissions trolleybuses powered by overhead electrical wires. The electricity to run all of Muni's trolleybuses and streetcars comes from the Hetch Hetchy Reservoir in Yosemite National Park. 
All Muni lines except for cable cars are wheelchair accessible. All bus lines have bicycle racks, but streetcars and cable cars do not. Because of San Francisco's geographical makeup (the city having neighborhoods located on hilltop-like areas, making it difficult for vehicles to drive up or down the streets), Muni operators are banned from using low-floor buses on certain routes with streets requiring buses or trolleybuses that are capable of reaching steep grades. But, as of 2013, high-floor vehicles are no longer available to be purchased by Muni; come 2019, all low-floor ones will be in service.
The longest Muni line is the 24.1-mile (38.8 km) 91 Owl, a nighttime-only route that blends several other routes together, while the longest daytime route is the 17.4-mile (28.0 km) 29 Sunset. The shortest route is the peak-hour only 88 BART Shuttle at 1.4 miles (2.3 km), while the shortest off-peak route is the 39 Coit at 1.6 miles (2.6 km). The steepest grade climbed by Muni vehicle is 23.1% by a diesel bus on the 67 Bernal Heights line, 22.8% by a trolleybus on the 24 Divisadero line, 21% by a cable car on the Powell-Hyde line, and 9% by a streetcar on the J Church line. 
The busiest Muni bus corridor is the Geary corridor. The two major routes that operate on the corridor, the 38 Geary and 38R Geary Rapid, travel 6.5 miles (10.5 km) in the east–west direction along the Geary corridor, and has an average speed of only 8 miles per hour (13 km/h),  taking over 50 minutes to travel from the Richmond District to the Transbay Terminal when operating on schedule.  As of 2015, the corridor has a total of 55,270 average daily boardings,  making it the second busiest transit corridor west of the Mississippi after the Los Angeles Metro Wilshire transit corridor. 
At Powell and Market Streets and California and Market Streets, three types of rail gauges come within a few hundred feet of each other: Bay Area Rapid Transit's 5 ft 6 in (1,676 mm) broad gauge (which is underground in the lower level of the tunnels), Muni Metro's 4 ft 8 1⁄2 in (1,435 mm) standard gauge (also underground in the upper level of the tunnels), and the San Francisco cable car system's 3 ft 6 in (1,067 mm) narrow gauge (at street level a few hundred feet away to the north of Market Street in both cases). The F Market heritage railway, which is also standard gauge, is also present here, at street level on Market Street. The rail lines, however, do not physically intersect.
Residents and visitors to San Francisco often remark upon the inefficiency of SF Muni. In November 1999 San Francisco voters passed Proposition E setting standards for performance of having at least an 85% on-time record  In July 2012 Muni vehicles were on-time 60% of the time and in August 2012, they were on-time 57% of the time.  A report conducted by the San Francisco Municipal Transport Agency in early 2013 noted that Muni was on time only 58% of the time. It delayed its customers a total of 172,195 hours and reduced the city's economic activity by US$50 million per year.  In 2013 the performance hit an all-time low of 57%, the on-time performance improved to 60% in January 2014, 60% in February 2014, and 60% in March 2014. 
As of 2019, performance continues to decline, with on-time percentage as follows: 
|Line||On-time trains||Late or very late trains|
Since the passage of Proposition E in November 1999, Muni has been part of the San Francisco Municipal Transportation Agency (SFMTA), a semi-independent city agency created by that ballot measure. The agency, into which Muni, the Department of Parking and Traffic, and the Taxicab Commission were merged, is governed by a seven-member Board of Directors appointed by the Mayor and confirmed by the Board of Supervisors. The acting Director of Transportaion of the SFMTA since August 15, 2019 has been Thomas Maguire, appointed by the SFMTA Board as the interim replacement for Director of Transportation Edward Reiskin.    On April 29, 2019, Director Reiskin announced that he would step down at the end of his contract in August 2019.   On November 13, 2019, the agency announced that Jeffrey Tumlin would take over as the new director on December 16, 2019. 
Muni has its origins in the period following the 1906 San Francisco earthquake. Until then the city had been served by a number of commercial horsecar, cable car and electric streetcar operators. Many of these had been amalgamated into the United Railroads of San Francisco (URR) company. In 1909, voters approved a municipal rail line down Geary. Three years later in 1912, the city declined to renew the franchise that bestowed cable car operator Geary Street, Park & Ocean Railway the privilege of operating on Geary Street, and converted the line into a municipal electric streetcar line,   the first line of Muni. In 1912, the average speed of the city's public transit was approximately 8.5 miles per hour  – slightly faster than the average speed of 8.1 in 2007. 
Muni soon started on a large building program. On December 29, 1914, the new Stockton Street Tunnel under Nob Hill opened, allowing streetcars from downtown to go to North Beach and the new Marina District. On February 3, 1918, the Twin Peaks Tunnel opened, making the southwestern quarter of the city available for development. On October 21, 1928, the Sunset Tunnel opened, bringing the N Judah streetcar line to the Sunset District. These improvements plunged Muni into direct competition with the URR on the entire length of Market Street. The two operators each operated its own pair of tracks down that thoroughfare, which came to be known as the "roar of the four". 
In 1941, Muni introduced its first trolleybus line, the R-Howard line. Trolleybuses had been running in San Francisco since 1935, but operated only by the Market Street Railway Company, successor to the URR. By 1944, the MSR was in financial difficulties. Thus, at 5 am on September 29, 1944, Muni acquired its commercial competitor. Along with the routes and equipment, Muni adopted its competitor's more expensive seven-cent fare.  Following national trends, Muni replaced most of its rail lines with trolleybus service in the succeeding decades. A few lines with dedicated rights-of-way (including those serving the Twin Peaks and Sunset tunnels) continued as rail lines running 1940s-era PCC streetcars through the 1970s. These lines became the foundation of the Muni Metro.
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In the 1950s and 1960s, the regional BART system was conceived as a much more extensive system than was eventually built, with plans for express trains through San Francisco and local service within San Francisco. Because it was assumed BART would provide local rail service, investment in Muni infrastructure failed to keep pace with major urban redevelopment projects. For example, BART was intended to provide Richmond district and Western Addition service as part of its Golden Gate Bridge/Marin line. This leaves a legacy of the inadequate 38-Geary bus serving these neighborhoods.
Construction on BART's Market street tunnel started in 1967,  with two decks tracks – the upper intended to provide local service. Major cost overruns in the BART project forced the state legislature to rescue the project in 1969: curtailing local service in San Francisco and converting the partially constructed stations into the basis of a new light-rail subway called the Muni Metro to connect the downtown stations to the Twin Peaks Tunnel and continuing along reserved tracks to St. Francis Circle. Construction on the metro began in 1970, but the project suffered from further cuts and design changes throughout the 1970s. The Muni Metro finally opened in February 1980, for one line (N-Judah),  with other lines following later in 1980, but the many design compromises and piecemeal planning led to long-term operational challenges and inefficiencies.
In 1970, Muni also suffered a severe diesel bus crisis.
Muni experienced a diesel bus availability crisis in 1981-2 when most of their diesel buses, 401 GMC and Flxible "New Looks" purchases in 1969, reached the end of their 12-year design life and funds for their replacement were not available. Most of the rest of the fleet were undersized 36-foot AM Generals purchased for neighborhood routes, and their use on heavier lines exacerbated conditions. The trolley bus fleet was in good order and had excess capacity at the time so Muni improvised a few temporary services with them to help out. One such service was a trolley 14-Limited that used the abandoned trolley overhead on South Van Ness. The diesel 82-Chinatown was replaced with short runs of the 30-Stockton. But the trolleys could only go where their wires went.
Muni adopted some policies to alleviate future service issues due to an aged fleet. They would stagger bus purchases so not as large a portion of the fleet would hit retirement age at once. They would arrange for mid-life rebuilds to keep the buses more serviceable in their final years. And they would work to reduce the role of diesels in the total operation. Three trunk diesel lines were converted to trolley bus service in the next twelve years.
But these efforts have not been as successful as hoped. Out of necessity most of the fleet, 330 standard bus equivalents out of 506, were replaced in just two years in 1985–6. (Standard bus equivalents factor the 30-foot and 60-foot into their equivalent capacity in 40-foot buses). And seven years passed without any new buses coming on board before Muni started its next full diesel fleet replacement cycle in 1999. This was fourteen years after the previous cycle instead of the twelve years that buses are designed to last. Muni is now aware that they must expect to keep diesel buses past their design life and have also found that funds granted for mid-life rebuilds require that the buses be kept longer still. As the fleet replacement cycle begins again in 2013, Muni has arranged for life-extending rebuilds of 142 buses, by count over 30% of the fleet.
In September 1982, the cable car system was shut down for 21 months for rebuilding, and there were massive line reorganizations as Muni restructured their route network to provide stronger cross-town services.
In 1983, Muni temporarily ran streetcars down Market Street as part of the San Francisco Historic Trolley Festival, initially conceived of as a substitute attraction for tourists during the one summer when no cable cars would be in operation.  The service became so popular that the festival was repeated for several years following.  Anticipating the return of permanent streetcar service on Market Street, Muni began rehabilitating tracks in 1987, a process that culminated in the opening of the F line in 1995.
The first modern Muni shelter was installed in front of the War Memorial Opera House in 1987. 
The F line was reintroduced in 1995 as a heritage streetcar service. Initially designed as a temporary tourist attraction to make up for the suspension of cable car service for rebuilding, the F has become a permanent fixture. E line service, initially known as the Muni Metro Extension, started in January 1998 initially as a shuttle between Embarcadero station and Caltrain's 4th and Townsend station.  
In June 1995, the San Francisco County Transportation Authority released The Four Corridor Plan, a vision to extend Muni Metro service along four major routes in the city: Bayshore (north-south along Third from the county line to California), Geary (east-west along Geary from 48th to Market/Kearny), North Beach (extending the new north-south Bayshore line along Kearny and Columbus to Fisherman's Wharf), and Van Ness (north-south along Van Ness from 16th and Mission to Aquatic Park), with a connector downtown to transfer between the Bayshore, Geary, and North Beach corridors.  These have since been implemented as a combination of light rail ( T Third and Central Subway) and bus rapid transit ( Geary and Van Ness) services.
During the late 1990s, with aging equipment and poor management, Muni developed a reputation for poor and erratic service. In 1996 a group called Rescue Muni representing transit riders formed to organize concerns and press for change, advocating for the successful 1999 Proposition E that formed the San Francisco Municipal Transportation Agency and set service standards for Muni. In August 1998, San Francisco residents witnessed a protracted malfunction of Muni Metro after switching to an automatic train control implemented by Alcatel Transport Automation, culminating in an event that is now known as the Muni Meltdown.
Automatic control of Muni Metro light rail vehicles began on Saturday, August 22, three years behind schedule and at a cost of $70 million, three times the original estimate.  Riders angry over delays confronted one driver during the Monday afternoon commute on August 24; he responded by locking himself in the driver's compartment and refused to move the train, halting all service for half an hour.  Otherwise, no delays were attributable to the new automatic control system that Monday.  However, by August 26, Mayor Willie Brown was threatening to sue Alcatel.  Alcatel and Muni instead blamed delays on malfunctioning train cars. In addition, a proof-of-payment fare enforcement system went into effect that week, compounding rider confusion. Finally, riders who had previously been able to secure a seat by riding in the opposite direction (outbound) to Embarcadero station were forced to disembark there because of the E/Muni Metro Extension service that had begun in January; these changes and the delays frustrated many commuters.  On Friday, August 28, 67 of the 131 LRVs (55 Boeing and 12 Breda) in the Muni Metro fleet were out of service for the morning commute; Mayor Brown personally rode from Civic Center to Embarcadero in the afternoon to experience the chaos for himself.  Muni riders abandoned the underground system for carpools, taxis, buses, and F-Market streetcars after LRVs were delayed and stopped with no communication as to when they would resume service; transit times from 4th and Irving to Powell swelled to 120 minutes. 
On August 31, two San Francisco Chronicle reporters staged a 1 1⁄2-mile (2.4 km) race: one took the train, and the other walked along Market from Civic Center to Embarcadero. The two reporters tied as both completed their trips in 23 minutes; this was an improvement compared to the previous week, at the height of the Meltdown, when the same trip on Muni Metro could take three times as long.  Mayor Brown re-enacted the race as the pedestrian on September 3; this time, Muni Metro service had improved and train passengers completed the trip in just seven minutes.  At the request of the San Francisco Examiner, a member of the executive committee for Rescue Muni tracked the length of each ride on her eight-stop daily commute to the Financial District from the Sunset that week. Four of the ten trips took longer than 40 minutes, and the best time was 15 minutes. 
By the third week of operation under automatic train control, the Muni Meltdown had passed and service was uneventful, albeit with fewer LRVs than normal  and with drivers onboard each train.  Muni officials apologized for the rough transition and promised to continue to improve service;  privately they called the Meltdown "the biggest fiasco in the railway's history." 
In an effort to improve service, Muni began to replace its troublesome fleet of Boeing-Vertol light rail vehicles with newer Italian Breda light rail vehicles in late 1996.  The two-decade-old fleet of Flyer trolleybuses were replaced with Electric Transit, Inc. (ETI) trolleybuses in the early 2000s.  Likewise, the diesel bus fleet saw an infusion of 45 new NABI buses from AC Transit in 1999.
Construction on a sixth light rail line from Caltrain Depot in Mission Bay to Visitacion Valley and Bayview/Hunters Point was completed in December 2006. The new line, named the T Third Street, consisted of 19 new high-platform stations at street-level.  
On October 8, 2007, SFMTA's cable car signs were awarded the AdWheel Award as the best in print promotion by the American Public Transportation Association. Nathaniel Ford, executive director of Muni, said that the "marketing group has done an outstanding job making the key boarding areas more attractive and inviting for residents and our guests." 
On November 15, 2007, city officials announced that they were looking into the possibility of adding double-decker buses to the Muni fleet, which would be operating mostly on the 38 Geary and the 14 Mission routes. The test period started on December 12, 2007, and ended on January 8, 2008.  
On December 1, 2007, Mayor Gavin Newsom announced that the entire city fleet, including all of Muni buses, are henceforth powered with biodiesel, a combination of 80% petroleum diesel fuel and 20% biofuel, to reduce carbon emissions.  Muni's current hybrid bus fleet currently runs on biodiesel.  
On December 5, 2009, the Muni system underwent its most extensive changes in over 30 years, in an attempt by the SFMTA to reduce its budget shortfall. This involved changes to over 60% of its bus and light rail routes, including the elimination of six bus routes. Changes included reduced frequency of service, shortened or altered routes, and earlier termination of service, although a few of the busiest lines, such as the 38 Geary, saw service increases. 
The 2010s started with severe cuts to Muni service. On February 26, 2010, the SFMTA board, which oversees Muni operations, voted for Muni to undergo further extensive changes in a further attempt to reduce its budget shortfall.   Months after the cuts were enacted, significant portions of the service were restored through additional funding and cutting operational costs.   Further improvements were made throughout the decade, amidst changes in both city and agency leadership, with the implementation of the "Muni Forward" project and all-door boarding.
In 2011, Nathaniel Ford, the head executive of the SFMTA, stepped down and Ed Reiskin took his place.  After the difficult cuts in 2010, city leaders cited the "Transit Effectiveness Project", later rebranded as "Muni Forward", as a priority for improving service on Muni.  In April 2015, the SFMTA launched the implementation of Muni Forward. Service changes involve renaming routes designated as "Limited" to "Rapid", a redesigned system map, and increased levels of service on the busiest bus routes.  Infrastructure improvements include the addition of transit signal priority, bus bulbs, and bus-only lanes to more locations, and trackway repairs along the Muni Metro system.  The 2010s also included the start of construction on bus rapid transit projects on Van Ness and Geary Streets   and the initiation of planning for new subway extensions that would potentially reach the Marina District  and Park Merced. 
On July 1, 2012, Muni was the first transit agency in North America to implement all-door boarding throughout its system. The practice already existed in the Muni Metro as Proof-of-Payment, and was expanded to include all bus service. 
With the Breda cars approaching 20 years of use, the SFMTA announced an order in 2014 for 175 new Siemens S200 cars for its Muni Metro lines.  The first of the new cars was delivered in November 2017  with plans to finish the replacement of the entire fleet by 2027.  This train procurement, in addition to replacing cars on existing lines, was made in order to supply the additional service required for the Central Subway and to the Mission Bay neighborhood and Chase Center.  Throughout the 2010s, Muni also procured new buses and replaced over 90 percent of its diesel bus fleet  and began replacement of its ageing trolleybuses, improving performance for its bus fleet. 
Amid the 2020 coronavirus pandemic, ridership numbers had dropped 70–90% across the system. Muni Metro services, with an over 90% decline in riders, were replaced by bus bridges on March 30 to streamline sanitation procedures.   By April 6, service had been eliminated on all but 17 of the agency's then 89 routes with San Francisco Municipal Transportation Agency Director of Transportation Jeffrey Tumlin calling it "the worst Muni service since 1906."  
Several proposals for Muni Metro and rail service expansion for Muni are undergoing planning and construction. In addition, several projects are underway to improve the effectiveness of existing lines, many as a part of the Muni Forward initiative. On February 19, 2016, Muni released a Draft Rail Capacity Study,  which outlines proposed system improvements through the year 2050+. This three tier proposal consists of enhancements that will improve system efficiency and expand the system; estimated cost is $9B – $16B. The ConnectSF planning project, a cooperation between several city agencies including Muni, is also preparing plans for future subway and rapid transit corridor expansion. 
Service improvements for existing rail routes that are underway include the N Judah Rapid Project  and L Taraval Improvement Project.  Improvements on the J, K, and M lines are planned in the future. 
A further underground expansion for the T line is under construction. Dubbed the Central Subway, three new underground stations at Moscone Center, Union Square, and Chinatown and one above-ground station at 4th and Brannan Streets are being built with a target opening date of 2021. Construction will include tunneling up to Columbus Ave and Washington Square Park but the T line will stop at Chinatown. This project is expected to cost about $1.4 billion. 
Muni is also considering a future extension into North Beach and Fisherman's Wharf or to the Marina District and The Presidio which may be built in a third phase of the T Third project. Formal planning for the extension began in late 2018 with an Alternatives Study.  
The average speed of Muni vehicles has been slowly declining over the years due to increasing vehicular congestion and is now merely 8 miles (13 km) per hour.  In response, Muni launched plans to make its transit vehicles move faster through the city. Muni Forward (previously called the Transit Effectiveness Project) was launched in May 2006 to take a comprehensive look at the entire Muni system and to see where service can be improved or streamlined to provide faster and more reliable service. The project was launched in a context in which twenty-five years had passed since the last comprehensive review, and travel patterns had changed, traffic congestion had increased, operating costs had risen and on-time performance had dropped since then. Under the Muni Forward project, service improvements were implemented on many lines such as the 5 Fulton  and 14R Mission.  Further improvements on lines such as the 28 19th Avenue,  22 Fillmore,   30 Stockton, and others are planned. 
For streetcar service, extending the E Embarcadero and the F Market and Wharves into Mission Bay and the Fort Mason Tunnel is possible.  Existing F Market & Wharves service is planned to be improved under the Better Market Street project with a new loop at Civic Center.
Additionally, there are plans to expand trolleybus service in several parts of the city. Several extensions to existing trolleybus lines are planned, including 14-Mission service to the Daly City BART station, 6-Haight-Parnassus service to West Portal Station, 33-Ashbury-18th service across Potrero Hill to Third Street, 45-Union-Stockton service to the Letterman Digital Arts Center in the Presidio and 24-Divisadero service into the former Hunters Point shipyard. Other expansion plans include electrification of some diesel bus lines, with the most likely lines for conversion being the 9-San Bruno, 10-Townsend and 47-Van Ness. Electrification of the 10-Townsend line would likely be joined by an extension of the line across Potrero Hill to San Francisco General Hospital. Other lines that may be electrified are the 7-Haight-Noriega, 27-Bryant, and 43-Masonic.      
Two bus rapid transit projects have been approved along the Geary Boulevard and Van Ness Avenue corridors, costing $240 to $270 million and $126 million respectively.   For Van Ness BRT, there will be two dedicated bus lanes in the median between Lombard Street and Mission Street. Geary BRT will have dedicated median lanes in the Richmond District area, then curbside bus lanes east to Market Street. Both corridors will include transit signal priority, all-door boarding, new low-floor buses, and improved stations. Construction broke ground on Van Ness BRT on March 1, 2017, with completion by 2020.  Initial construction on Geary BRT began in October 2018 with planned completion in 2022.  
The SFMTA is also studying a bus rapid transit route on the Geneva-Harney corridor on the southeast side of the city. The new service would connect Balboa Park station to Hunter's Point via Sunnydale station and Bayshore Station along Geneva Ave and Harney Way. The improved service is estimated to cut the 36 minute trip along the route to 25 minutes once complete in 2023. The project is currently[ when?] undergoing environmental review. 
- Key System
- Market Street Railway Company
- San Francisco cable car system
- Trolleybuses in San Francisco
- The entire travel time including all transfers must be completed within 120 minutes to qualify as one fare. 
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