Inbound T Third train at Castro station
|Owner||San Francisco Municipal Transportation Agency|
|Locale||San Francisco, California|
|Transit type||Light rail/ Streetcar|
|Number of lines||6|
(plus 1 peak-hour shuttle line)
|Number of stations||33 (9 subway, 24 surface)
87 additional surface stops
|Daily ridership||162,500 (average weekday, Q4 2017) |
|Annual ridership||51.5 million (2017) |
|Began operation||February 18, 1980|
|Operator(s)||San Francisco Municipal Railway|
|Number of vehicles||151
Breda light rail vehicles (high floor)|
68 Siemens light rail vehicles
on order (high floor) 
|Train length||75–225 feet (22.9–68.6 m) (1–3 LRVs)  |
|System length||36.8 mi (59.2 km) |
|Track gauge||4 ft 8 1⁄2 in (1,435 mm) standard gauge |
|Electrification||Overhead lines, 600 V DC |
|Average speed||9.6 mph (15.4 km/h) |
|Top speed||50 mph (80 km/h) |
The Muni Metro is a light rail system serving San Francisco, California, United States, operated by the San Francisco Municipal Railway (Muni), a division of the San Francisco Municipal Transportation Agency (SFMTA). With an average weekday ridership of 157,700 passengers as of the fourth quarter of 2019, Muni Metro is the United States' second busiest light rail system.  Muni Metro operates a fleet of 151 Breda light rail vehicles (LRVs), which are being supplemented and replaced by Siemens S200 SF LRVs.
Muni Metro is the modern incarnation of the traditional streetcar system that had served San Francisco since the late 19th century. While many streetcar lines in other cities, and even in San Francisco itself, were converted to buses after World War II, five lines survived until the early 1980s, when they were rerouted into the newly built Market Street subway. The system today traverses a number of different types of rights of way, including tunnels, reserved surface trackage with at-grade street crossings, and streetcar sections operating in mixed traffic; surface stops range from high-platform stations to traditional curbside streetcar stops. Recently, the system has undergone expansion, most notably the Third Street Light Rail Project, completed in 2007, which started the first new rail line in San Francisco in over half a century. Other projects, such as the Central Subway, are underway.
The first street railroad in San Francisco was the San Francisco Market Street Railroad Company, which was incorporated in 1857 and began operating in 1860, with track along Market Street from California to Mission Dolores.  Muni Metro descended from the municipally-owned traditional streetcar system started on December 28, 1912, when the San Francisco Municipal Railway (Muni) was established.  The first streetcar line, the A Geary, ran from Kearny and Market Streets in the Financial District to Fulton Street and 10th Avenue in the Richmond District.   The system slowly expanded, opening the Twin Peaks Tunnel in 1917,  allowing streetcars to run to the southwestern quadrant of the city. By 1921, the city was operating 304 miles (489 km) of electric trolley lines and 25 miles (40 km) of cable car lines.  The last line to start service before 2007 was the N Judah, which started service after the Sunset Tunnel opened in 1928. 
In the 1940s and 1950s, as in many North American cities, public transit in San Francisco was consolidated under the aegis of a single municipal corporation, which then began phasing out much of the streetcar network in favor of buses.  However, five heavily used streetcar lines traveled for at least part of their routes through tunnels or otherwise reserved right-of-way, and thus could not be converted to bus lines.  As a result, these lines, running PCC streetcars, continued in operation.
Original plans for the BART system drawn up in the 1950s envisioned a double-decked subway tunnel under Market Street (known as the Market Street subway) in downtown San Francisco; the lower deck would be dedicated to express trains, while the upper would be served by local trains whose routes would spread south and west through the city. However, by 1961 these plans were altered; only a single BART route would travel through the city on the lower deck, while the upper deck would be served by the existing Muni streetcar routes.  The new tunnel would be connected to the existing Twin Peaks Tunnel. The new underground stations would feature high platforms, and the older stations would be retrofitted with the same, which meant that the PCCs could not be used in them. Hence, a fleet of new light rail vehicles was ordered from Boeing-Vertol, but were not delivered until 1979–80, even though the tunnel was completed in 1978. The K and M lines were extended to Balboa Park during this time, providing further connections to BART. (The J line also saw an extension there in 1991, which provided yet another BART connection at Glen Park.)
On February 18, 1980, the Muni Metro was officially inaugurated, with weekday N line service in the subway.  The Metro service was implemented in phases, and the subway was served only on weekdays until 1982. The K Ingleside line began using the Metro subway on weekdays on June 11, 1980, the L Taraval and M Ocean View lines on December 17, 1980, and lastly the J Church line on June 17, 1981.  Meanwhile, weekend service on all five lines (J, K, L, M, N) continued to use PCC cars operating on the surface of Market Street through to the Transbay Terminal, and the Muni Metro was closed on weekends. At the end of the service day September 19, 1982, streetcar operations on the surface of Market Street were discontinued entirely, the remaining PCC cars taken out of service, and weekend service on the five light rail lines was temporarily converted to buses.   Finally, on November 20, 1982, the Muni Metro subway began operating seven days a week. 
At the time, there were no firm plans to revive any service on the surface of Market Street or return PCCs to regular running.  However, tracks were rehabilitated for the 1983 Historic Trolley Festival,  and the inauguration of the F Line, served by heritage streetcars, followed in 1995.
By the late 1980s, Muni scheduled 20 trains per hour (TPH) through the Market Street subway at peak periods, with all trains using the crossover west of Embarcadero station to reverse direction.. To allow for high frequencies on the surface branches, eastbound trains were combined at West Portal and Duboce Portal, and westbound trains split at those locations. Two-car N Judah trains and one-car J Church trains (each 10TPH) combined at the Duboce Portal, while two-car L Taraval trains (10TPH) alternately combined with two-car M Ocean View and K Ingleside (each 5 TPH) trains at West Portal to form four-car trains. However, this provided suboptimal service; many inbound trains did not arrive at the portals in time to combine into longer trains. 
In the mid- to late-1990s, San Francisco grew more prosperous and its population expanded with the advent of the dot-com boom, and the Metro system began to feel the strain of increased commuter demand. Muni criticism had been something of a feature of life in San Francisco, and not without reason. The Boeing trains were sub-par and grew crowded quickly.  And the difficulty in running a hybrid streetcar and light rail system, with five lines merging into one, led to scheduling problems on the main trunk lines with long waits between arrivals and commuter-packed trains sometimes sitting motionless in tunnels for extended periods of time. 
Muni did take steps to address these problems. Newer, larger Breda cars were ordered, an extension of the system towards South Beach — where many of the new dot-coms were headquartered — was built, and the underground section was switched to Automatic Train Operation (ATO). The Breda cars, however, came in noisy, overweight, oversized, under-braked, and over-budget (their price grew from US$2.2 million per car to nearly US$3 million over the course of their production).   In fact, the new trains were so heavy (10,000 pounds (4,500 kg) more than the Boeing LRVs they replaced) that some homeowners, claiming that the exceptional weight of the Breda cars damaged their foundations, sued the city of San Francisco.  The Breda cars are longer and wider than the previous Boeing cars, necessitating the modification of subway stations and maintenance yards, as well as the rear view mirrors on the trains themselves.  Furthermore, the Breda cars do not run in three car trains, like the Boeing cars used to, as doing so had, in some instances, physically damaged the overhead power wires.  The Breda trains were so noisy that San Francisco budgeted over $15 million to quiet them down, while estimates range up to $1 million per car to remedy the excessive noise.  To this day, the Breda cars are noisier than the PCC or Boeing cars. In 1998, NTSB inspectors mandated a lower speed limit of 30 mph (48 km/h), down from 50 mph (80 km/h), because the brakes were problematic.  
The ATC system was plagued by numerous glitches when first implemented, initially causing significantly more harm than good. Common occurrences included sending trains down the wrong tracks, and, more often, inappropriately applying emergency braking.  Eventually the result was a spectacular service crisis, widely referred to as the "Muni meltdown", in the summer of 1998. During this period, two reporters for the San Francisco Chronicle—one riding in the Muni Metro tunnel and one on foot on the surface—held a race through downtown, with the walking reporter emerging the winner. 
After initial problems with the ATC were fixed, substantial upgrades to the entire Muni transit systems have gone a long way towards resolving persistent crowding and scheduling issues. Nonetheless, Muni remains one of the slowest urban transport systems in the United States.
In 1980, the M Ocean View was extended from Broad Street and Plymouth Avenue to its current terminus at Balboa Park.  In 1991, the J Church was extended from Church and 30th Streets to its current terminus at Balboa Park.  In 1998, the N Judah was extended from Embarcadero Station to the planned site of the new Pacific Bell Park and Caltrain Depot,  after that extension was briefly served between January and August of that year by the temporary E Embarcadero   light rail shuttle (restored in 2015 as the E Embarcadero heritage streetcar line).
In 2007, the T Third Street, running south from Caltrain Depot along Third Street to the southern edge of the city, opened as part of the Third Street Light Rail Project. Limited weekend T line service began on January 13, 2007, while full service began on April 7, 2007. The line initially ran from the southern terminus at Bayshore Boulevard and Sunnydale Street to Castro Street Station in the north. The line ran into initial problems with breakdowns, bottlenecks, and power failures, creating massive delays.  Service changes to address complaints with the introduction of the T Third Street were implemented on June 30, 2007, when the K and T trains were interlined, or effectively merged into one single line with route designations changing at the entrances into the subway (T becomes K outbound at Embarcadero; K becomes T inbound at West Portal). 
Several expansion projects are underway or under study. Federal funding has been secured for, and construction has begun on, the Central Subway,  a combined surface and subway extension of the T Third Line, running from Caltrain Depot to Chinatown, with stops at Moscone Center and Union Square, and with the potential for a future expansion to North Beach and Fisherman's Wharf.  Muni estimates that the Central Subway section of the T Third Line will carry roughly 35,100 riders per day by 2030.  The Central Subway is projected to be complete and ready for revenue service by 2021,   at a projected cost of $1.578 billion.  Once the Central Subway is complete, it may also continue as an above-ground light rail line through North Beach, and into the Marina district, with the possibility of eventually terminating in the Presidio. 
A project to grant the M Ocean View its own separated right-of-way called the Muni Subway Expansion Project, building off of a 2014 SFCTA study, is undergoing preliminary engineering studies by the SFMTA as of 2018.   The project would extend the Muni subway service in a tunnel under 19th Avenue, providing grade-separated service from Embarcadero station to a proposed Park Merced station.
The 20-year Capital Plan for the SFMTA also lists both a Geary Light Rail project (a surface-subway light rail line to the Richmond District via Geary Boulevard) and a Geneva Avenue Light Rail project (a light rail line connecting Balboa Park station to the terminus of the T Third line). 
The Muni Metro system consists of 71.5 miles (115.1 km) of standard gauge track, seven light rail lines (six regular lines and one peak-hour line), three tunnels, nine subway stations, 24 surface stations, and 87 surface stops. 
The backbone of the system is formed by two interconnected subway tunnels, the older Twin Peaks Tunnel and the newer Market Street subway, both controlled by automatic train operation systems to run trains with the operators closing the door to allow the train to pull out of a station. This ATO system was upgraded in 2015 to replace outdated software and relays.  The tunnels, 5.5 miles (8.9 km) in total length,  run from West Portal Station in the southwestern part of the city to Embarcadero Station in the heart of the Financial District. Three lines—the K Ingleside, the L Taraval, and the M Ocean View—feed into the tunnel at West Portal, while two lines, the J Church and N Judah, enter at a portal near Church Street and Duboce Avenue in the Duboce Triangle neighborhood. Two lines, the N Judah and T Third Street, enter and exit the tunnel at Embarcadero. An additional tunnel, the Sunset Tunnel, is located near the Duboce portal and is served by the N.
The interconnected tunnels contain nine subway stations.  Three stations—West Portal, Forest Hill and the now-defunct Eureka Valley—were opened in 1918 as part of the Twin Peaks Tunnel,  while the other seven— Castro Street, Church Street, Van Ness, Civic Center, Powell Street, Montgomery Street and Embarcadero—were opened in 1980 as part of the Market Street subway. Four stations, Civic Center, Powell Street, Montgomery Street, and Embarcadero, are shared with Bay Area Rapid Transit (BART), with Muni Metro on the upper level and BART on the lower one. 
Above ground, there are twenty-four surface platform stations.  Two stations, Stonestown and San Francisco State University are located at the southwestern part of the city, while the rest are located on the eastern side of the city, where the system underwent recent expansion as part of the Embarcadero extension and the Third Street Light Rail Project. However, many of the stops on the system are surface stops consisting of anything from a traffic island to a yellow-banded "Car Stop" sign painted on a utility pole. 
All subway and surface stations are handicap-accessible. In addition, several surface street stops are also handicap-accessible, often consisting of a ramp leading up to a small platform for boarding. 
In Muni Metro terminology, an inbound train is one that heads from the western neighborhoods and West Portal towards Embarcadero, while an outbound train travels in the opposite direction out of downtown towards the west. Even the T Third Street Line is consistent with this terminology, with an inbound train going from West Portal through Embarcadero to Sunnydale, and an outbound train running out of the southeastern neighborhoods into downtown. 
Muni Metro has two rail yards for storage and maintenance:
- Green Yard or Curtis E. Green Light Rail Center at 425 Geneva Avenue is located adjacent to Balboa Park Station and serves as the outbound terminus for the J Church, K Ingleside, and M Ocean View. The facility has repair facilities, an outdoor storage yard and larger carhouse structure. The facility was renamed for former and late head of Muni in 1987. 
- Muni Metro East is a newer facility opened in 2008 and is located along the Central Waterfront on Illinois and 25th Streets in the Potrero Hill neighborhood, a block from the T Third Street line.  The 180,000-square-foot (17,000 m2) maintenance facility with outdoor storage area is located next to Northern Container Terminal and former Army Pier.
opened  
|J Church||1917||Embarcadero||Balboa Park|
continues as T Third Street
|L Taraval||1919||Embarcadero||Wawona and 46th Avenue (SF Zoo)|
|M Ocean View||1925||Embarcadero||San Jose and Geneva (Balboa Park)|
|N Judah||1928||4th and King||Judah and La Playa (Ocean Beach)|
|T Third Street||2007||Sunnydale||
continues as K ingleside
(peak hours & game days)
4th and King
UCSF/Chase Center (game days)
|Manufacturer||Boeing Vertol||Breda||Siemens Mobility|
|Model||US SLRV ||San Francisco LRV   ||S200 SF |
|Muni designation||LRV1||LRV2/3 [a]||LRV4|
|Dates in Service||1979–2002||1996–2027 (projected)||2017–|
|Quantity||131 [b]||151 [c]||219 (264) [d]|
|Trucks/Axles||3 trucks (2 powered), 6 axles (total)|
|Width||8 feet 10 inches
|8 feet 8.32 inches|
|Height||11 feet 6 inches|
|Weight (empty)||67,000 pounds
(36,100 kilograms) 
|Power||2×210 hp (160 kW) DC motors||4×130 hp (97 kW) AC motors||4×174 hp (130 kW) motors|
|Distance between failures||up to 2,000 miles
(3,200 kilometres) 
(8,900 kilometres) 
- LRV3 cars were delivered starting in 1999; the LRV3s featured some minor design changes that were later retrofitted to the earlier LRV2s. 
- Original order of 80 expanded to 100. 31 additional vehicles were purchased from a lot of 40 rejected by MBTA, the other operator using SLRVs
- Original order of 35 (12/1991) expanded to 151 by exercising options: +5 (40 total, 11/1992); +4 (44 total, 5/1993); +8 (52 total, 12/1993); +25 (77 total, 4/1996). The last 74 (ordered as +59, 10/1998; +15, 5/1999) were delivered as LRV3 vehicles starting in 1999. 
- Total firm orders are for 219 vehicles. The 264 vehicles are broken down as: 151 to replace the Breda LRV2/3 fleet, 24 for Central Subway service, and 89 more for projected increases in ridership. Of the 219 firm orders, the first order in 2014 was for 175 (151+24),  Muni exercised its option on an additional 40 LRV4s in June 2015  and ordered 4 more LRV4s in June 2017 for anticipated Warriors service (Phase W).  The first 68 vehicles are designated the "future fleet": 24 Central Subway cars (Phase 1), 40 expansion LRV4s (Option 1), and 4 LRV4s (Phase W). The 68-car "future fleet" procurement is expected to complete delivery by October 2019.  The next cars to be delivered, starting in 2021, will be the 151 "replacement fleet" LRV4s (Phase 2) to retire the existing Breda fleet.  As of June 2018, 20 cars are in revenue service and 10 are in testing. 
Muni Metro first operated Boeing Vertol-made US Standard Light Rail Vehicles (USSLRV), which were built for Muni Metro and Boston's MBTA.   Boeing had no experience in making LRVs,  and has not made another since.  The first cars of the initial 100-car order arrived in San Francisco in 1978; Boston had been running the cars since 1976 and by 1978, MBTA was already returning 35 cars for manufacturing defects.  After receipt of the first cars, MBTA forced Boeing to make 70 to 80 modifications on each car. Boeing ended up paying US$40,000,000 (equivalent to $179,719,298 in 2019) in damages to Boston.  The purchase price for each car was US$333,000 (equivalent to $1,305,326 in 2019). 
The federal government offered to provide 80% of the funds for design and production of the USSLRV  in exchange for a commitment to keep the cars in service for at least 25 years,  but the cars, as-delivered, were prone to jammed doors, defective brakes and motors, leaky roofs, mechanical breakdowns, and were involved in several accidents.  Muni Metro added 30 more cars to the fleet; these 30 had been rejected by MBTA after suffering numerous breakdowns.  
In 1982, the Boeing cars averaged only 600 miles (970 km) between breakdowns; by 1988 this had improved to 1,800 to 2,000 miles (2,900 to 3,200 km) between breakdowns.  In 1998, Rudy Nothenberg, president of the Public Transportation Commission, said the Boeing cars were "impossible to maintain and [...] have many, many design flaws;"  that same year, Muni was only able to supply 66–72 working cars for rush-hour service instead of the required 99 cars, resulting in system delays.  Despite the shortcomings of the USSLRV design, these cars constituted the entire light rail fleet until 1996, when new Breda-manufactured cars were put into service,  replacing Boeing cars as they were accepted for service.  By 1998, the 136-car Muni Metro fleet consisted of 57 Boeing Vertol cars and 79 Breda cars. 
Two Boeing cars were preserved for potential donation to the San Francisco Railway Museum, but have since been scrapped;  five were sold to the Greater Manchester Passenger Transport Authority for the modest price of US$200 (equivalent to $284.29 in 2019) to US$500 (equivalent to $710.73 in 2019) each; one was acquired by the Oregon Electric Railway Historical Society in 2001, but the Society declined to take any more Boeing cars after experiencing several breakdowns.  Boeing car no. 1258 has been on exhibit at the Western Railway Museum near Suisun City since its acquisition in 2002. 
The first of four prototypes of the new Breda cars was delivered in January 1995.  After delivery of additional cars and training of operators, the cars began to enter service on December 10, 1996. They were the most expensive street railway vehicles built to-date, at a cost of US$2,000,000 (equivalent to $3,260,344 in 2019) each, and they were assembled at Pier 80.  After suffering initial breakdowns  and despite facing complaints of noise and vibrations,   the Bredas gradually replaced the Boeings, with the last Boeing car being retired in 2002.  Residents along streetcar lines complained the new Breda cars would screech during acceleration and deceleration and their 80,000-pound (36,000 kg) weight, 10,000 pounds (4,500 kg) heavier than the Boeing cars,  was blamed for vibration issues.  At one point in 1998, 12 Breda cars were unavailable for service due to door problems.  Faulty couplers on the Breda cars have been blamed for reduced train capacity, as multiple cars are not able to be coupled together as intended. 
Muni originally ordered 35 cars from Breda in 1991, and exercised options to add another 116 cars throughout the 1990s, including an option to purchase another 15 cars in 1999.   The fleet had 151 LRVs in 2014, all made by Breda.   The double-ended cars are 75 feet (23 m) long, 9 feet (2.7 m) wide, 11 feet (3.4 m) high, have graffiti-resistant windows, and contain an air-conditioning system to maintain a temperature of 72 °F (22 °C) inside the car.  The Breda cars feature four doors per car, versus three for the Boeing (although only the middle two were available while in the tunnels due to the cars' end curvature).  The initial batch of 136 Breda cars were ordered on contracts exceeding US$320,000,000 (equivalent to $491,122,653 in 2019), for an average per-car cost of US$2,350,000 (equivalent to $3,606,682 in 2019); the option of 15 additional cars was exercised on a contract worth US$42,300,000 (equivalent to $64,920,276 in 2019), making the last batch of 15 cars US$2,600,000 (equivalent to $3,990,372 in 2019) each. 
With the construction of the Central Subway and ongoing system capacity increase, there are plans to add 24 more cars with Siemens, Kawasaki, and CAF having been prequalified to bid; Breda was disqualified based on a ranking of potential bidders.  The contract was awarded to Siemens for the purchase of a total of 260 cars,  and Muni is expected to choose from three initial designs in the new S200 class. The 260 cars would be delivered in three phases: the initial batch of 24 would be used on the new Central Subway, the next batch of 151 would replace the existing fleet starting in 2021 as they reached their 25-year life expectancy, and another 85 would be added, funding permitting, to accommodate projected ridership growth through 2040.  Muni partially exercised their option and added 40 cars from the third phase by 2015.  By November 2019, the Siemens order totaled 219 vehicles: 151 cars to replace the Breda LRV2/3 fleet, and 68 cars to accommodate expansion plans. Delivery of the "future fleet" of 68 expansion cars was completed in October 2019. 
Upon awarding the contract, Muni officials cited several lessons learned from the prior Breda contract, including not buying enough cars, dictating too much of the design, lax reliability requirements, and a failure to account for maintenance costs.  The US$648,000,000 (equivalent to $699,829,069 in 2019) contract for 175 cars (the first two phases) was signed by Mayor Ed Lee in September 2014, making the cost of each car approximately US$3,700,000 (equivalent to $3,995,938 in 2019).  They are expected to have the same coupling device as the Breda cars, however, the new Siemens trains can couple up to five cars at a time.   
Siemens has named the new Muni cars the S200 SF, while the SFMTA refers to them as the LRV4. They operate at speeds of up to 50 miles per hour (80 km/h).  The S200 SF is 75 feet (23 m) long, 8 feet 8.32 inches (2.65 m) wide, 11 feet 6 inches (3.51 m) high (with the pantograph locked down), and weighs 78,770 pounds (35,730 kg), making it comparable in size and weight to the existing Breda cars.  The expected maximum capacity is 203 passengers per car. 
The new S200 SF vehicles are projected to be able to run 59,000 miles (95,000 km) between maintenance intervals.  Initially, the new cars had a mean distance between failures (MDBF) of 3,300 mi (5,300 km) shortly after being delivered; by August 2019, the MDBF had improved to 8,000 mi (13,000 km).  In comparison, the Breda-based fleet was only able to manage 617 mi (993 km) between failures in 2011.  
Siemens publicly unveiled a full-size mockup of the S200 SF in San Francisco on June 16, 2015.  The first 64 S200 SF cars will be used to expand the Muni fleet to 215 cars; once the fleet reaches 215 cars, Breda cars will be retired as new Siemens cars are accepted.  On July 2, 2015, Muni was awarded a grant of $41 million from the California Transportation Agency to eventually pay for 40 of the 64 additional Siemens light rail vehicles.  The first car was delivered from the Siemens plant in Sacramento to San Francisco on January 13, 2017; it is expected that deliveries will continue through 2028.  In early November 2017, a test car passed a CPUC regulatory inspection with only minor correctable issues and received permission to begin revenue service as early as November 15. The five additional test cars may be certified by December. 
The first S200, #2006, went into service on November 17, 2017, following a ribbon-cutting ceremony at Duboce and Church.  Muni also announced that instead of bringing 24 new cars in service in 2018, 68 would be commissioned because of speedy production.  Two-car LRV4 trains entered service in June 2018.  Three-car trains have been tested, and SFMTA is planning to use three-car trains for special events and peak hour service as early as the second quarter of 2018. 
Muni Metro runs from approximately 5 am to 1 am weekdays, with later start times of 7 am on Saturday and 8 am on Sunday.  Owl service, or late-night service, is provided along much of the L and N lines by buses that bear the same route designation. 
The cash fare for Muni Metro, like Muni buses, effective January 1, 2020, is $3 for adults and $1.50 for youth ages 5–17, seniors, and the disabled. Clipper and MuniMobile fares are lower than cash fares. Their fares are $2.50 for adults and $1.25 for youth ages 5–17, seniors, and the disabled. 
Muni currently operates a Free Muni for Seniors program that provides low- and moderate-income seniors residing in San Francisco free access to all Muni transit services, including Muni's cable cars. Free Muni is open to all San Francisco senior Clipper card holders, ages 65 and over, with a gross annual family income at or below 100 percent of the Bay Area Median Income level (qualifying income levels are posted on the program's web page). Enrollment is not automatic. To participate in the program, a qualified senior must have or obtain a Clipper card and submit an application either online or by mail.
Like Muni buses, the Muni Metro operates on a proof-of-payment system;  on paying a fare, the passenger will receive a ticket good for travel on any bus, historic streetcar, or Metro vehicle for 120 minutes.  Payment methods depend on boarding location. On surface street sections in the south and west of the city, passengers must board at the front of the train and pay their fare to the train operator to receive their ticket; those who already have a ticket, or who have a daily, weekly, or monthly pass, can board at any door of the Metro streetcar.  Subway stations have controlled entries via faregates, and passengers usually purchase or show Muni staff a ticket in order to enter the platform area. Faregates closest to an unmanned Muni staff booth open automatically if a passenger has a valid pass or transfer that cannot be scanned.  Muni's fare inspectors may board trains at any time to check for proof of payment from passengers. 
All cars are also equipped with Clipper card readers near each entrance, which riders may use to tag their cards to pay their fare. The cards themselves are then used as proof of payment; fare inspectors carry handheld card readers that can verify that payment was made. In subway stations, riders instead tag their cards on the faregates to gain access to the platforms.
- Market Street Railway and other rail lines operated by MUNI:
- SelTrac, the automated train system used in the Market Street subway
- Light rail in the United States
- Streetcars in North America
- List of United States light rail systems by ridership
- List of North American light rail systems by ridership
- List of California railroads
- List of tram and light rail transit systems
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