The San Diego Metropolitan Transit System (''SDMTS'' or often simply ''MTS'') is a
public transit
Public transport (also known as public transportation, public transit, mass transit, or simply transit) is a system of transport for passengers by group travel systems available for use by the general public unlike private transport, typic ...
service provider for Central, South, Northeast and Southeast
San Diego County
San Diego County (), officially the County of San Diego, is a county in the southwestern corner of the U.S. state of California. As of the 2020 census, the population was 3,298,634, making it California's second-most populous county and the f ...
. The agency directly operates a large
transit
Transit may refer to:
Arts and entertainment Film
* ''Transit'' (1979 film), a 1979 Israeli film
* ''Transit'' (2005 film), a film produced by MTV and Staying-Alive about four people in countries in the world
* ''Transit'' (2006 film), a 2006 ...
system that includes the
MTS Bus,
San Diego Trolley
The San Diego Trolley is a light rail system operating in the metropolitan area of San Diego. It is known colloquially as "The Trolley". The Trolley's operator, San Diego Trolley, Inc. (SDTI), is a subsidiary of the San Diego Metropolitan Tr ...
light rail, and
Rapid
Rapids are sections of a river where the river bed has a relatively steep gradient, causing an increase in water velocity and turbulence.
Rapids are hydrological features between a ''run'' (a smoothly flowing part of a stream) and a ''cascade ...
bus rapid transit services. The MTS also controls the
San Diego and Arizona Eastern (SD&AE) freight railway and regulates
taxicab
A taxi, also known as a taxicab or simply a cab, is a type of vehicle for hire with a driver, used by a single passenger or small group of passengers, often for a non-shared ride. A taxicab conveys passengers between locations of their choi ...
s,
jitneys, and other private for-hire passenger transportation services.
MTS is one of the oldest transit systems in Southern California, with predecessors dating back as early as the 1880s. The current agency started operations in 1976 as the San Diego Metropolitan Transit Development Board (''MTDB'') and changed to its current name in 2005.
The MTS works closely with the
North County Transit District (NCTD), which operates public transit services in Northern San Diego County, and the
San Diego Association of Governments (SANDAG), which plans, develops, and constructs transit projects for both the MTS and NCTD.
In , the system had a ridership of , or about per weekday as of .
History
Origins

San Diego's public transportation traces its roots back to the San Diego Street Car Company, which opened a single line on July 3, 1886, with cars
drawn by two mules or horses. The system would eventually expand to five lines across
Downtown San Diego
Downtown San Diego is the city center of San Diego, California, the eighth largest city in the United States. In 2010, the Centre City area had a population of more than 28,000. Downtown San Diego serves as the cultural and financial center and ...
.
At the same time as the first horse-drawn line was being inaugurated, there were already plans to start up an electric streetcar service in San Diego, with at least some service starting in November 1887.
The
San Diego Electric Railway (SDERy), the direct predecessor of today's MTS, was founded in 1891 by
John D. Spreckels
John Diedrich Spreckels (August 16, 1853 – June 7, 1926), the son of German-American industrialist Claus Spreckels, founded a transportation and real estate empire in San Diego, California, in the late 19th and early 20th centuries. The entrepr ...
(who would later go on to build the
San Diego and Arizona Railway
The San Diego and Arizona Railway was a Short-line railroad, short line United States, U.S. railroad founded by entrepreneur John D. Spreckels, and dubbed "The Impossible Railroad" by engineers of its day due to the immense logistical challeng ...
). The SDERy would greatly expand electric streetcar service by purchasing several existing transit companies and converted them to electric operation.

In 1910, Spreckels was able to force a ballot initiative that amended his charter with the City of San Diego to give him more than 25 years on his leases to operate streetcar service. Passage of the initiative allowed the SDERy to secure loans that led to service expansion.
The electric streetcar system took a big hit during the "Great Flood" of 1916 that washed out several lines. Rebuilding was a challenge as
World War I
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was List of wars and anthropogenic disasters by death toll, one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, ...
increased the cost of railway construction materials by 50 to 150 percent. Simultaneously, private automobiles became more common, with many owners picking up work as
jitney drivers who would cruise the streetcar routes and pick up fares.
The first motor bus hit the San Diego area streets in 1922, operating between National City and Chula Vista. Over the next two decades, the rail lines would gradually be replaced by motor buses, and on April 24, 1949, the last rail service was discontinued, making San Diego the first major city in California to convert to an all-bus system.
In 1948, the Spreckels family sold the San Diego Electric Railway Company to Jesse L. Haugh, who renamed it the San Diego Transit System and invested in updating and improving the system. Despite the improvements, ridership drops. Facing a financial crisis, the city of San Diego took control of the system in 1967, renaming it the San Diego Transit Corporation, which is to be operated as a non-profit. In 1970, to boost struggling ridership, fares that ranged from 35¢ to $1.15 were lowered to a flat 25¢ fare. By the end of the decade, annual ridership would improve from 18 million to 35 million.
Planning for mass transit
The Comprehensive Planning Organization (now known as
SANDAG), an intergovernmental agency of 13 cities and San Diego County, was established in 1966. The group began planning a mass transit system for the area, studying technologies, alignments, and costs, but the plans went nowhere due to disagreements between stakeholders.
In 1975, California established the San Diego Metropolitan Transit Development Board (MTDB) with a clear mission: plan, construct and operate a mass transit system. The agency formally started operations on January 1, 1976. The MTDB also struggled to resolve stakeholders' disagreements over the same issues of technologies, alignments and costs.
On September 10, 1976, nature intervened, setting off a chain of events that would help decide the first mass transit line.
Hurricane Kathleen destroyed major sections of track and bridges on the San Diego and Arizona Railway's the ''Desert Line'' east of San Diego. The Southern Pacific, which had previously purchased the line from the Spreckels family and renamed it the
San Diego and Arizona Eastern Railway (SD&AE), wanted to abandon the railway, a request that was denied by the
Interstate Commerce Commission
The Interstate Commerce Commission (ICC) was a regulatory agency in the United States created by the Interstate Commerce Act of 1887. The agency's original purpose was to regulate railroads (and later trucking) to ensure fair rates, to elimina ...
in 1978. The MTDB stepped in and offered to buy the SD&AE for $18.1 million if the Southern Pacific fully repaired the line. The deal closed on August 20, 1979.
The purchase gave MTDB two sections of right-of-way that could be used for mass transit: the SD&AE Main Line from Downtown San Diego to the
San Ysidro Port of Entry
__NOTOC__
The San Ysidro Port of Entry (aka San Ysidro Land Port of Entry or San Ysidro LPOE) is the largest land border crossing between San Diego and Tijuana, and the fourth- busiest land border crossing in the world (second-busiest if one excl ...
and the SD&AE La Mesa Branch from Downtown San Diego to El Cajon. The MTDB decided to build a relatively low cost
light rail system over the tracks,
a new idea for the United States, but one that was
well established in Germany.
The MTDB also continued to operate the freight operations of the SD&AE. The board reached a deal with the
San Diego and Imperial Valley Railroad
The San Diego and Imperial Valley Railroad (SD&IV) is a class III railroad operating freight rail service in the San Diego area, providing service to customers in the region and moving railcars between the end of the BNSF Railway in Downtown Sa ...
to continue to move railcars from the end of the
Santa Fe Railway
The Atchison, Topeka and Santa Fe Railway , often referred to as the Santa Fe or AT&SF, was one of the larger railroads in the United States. The railroad was chartered in February 1859 to serve the cities of Atchison and Topeka, Kansas, and S ...
in Downtown San Diego to either industrial customers in the San Diego area or to the
Mexico–United States border
The Mexico–United States border ( es, frontera Estados Unidos–México) is an international border separating Mexico and the United States, extending from the Pacific Ocean in the west to the Gulf of Mexico in the east. The border trav ...
in San Ysidro.
The return of rail

In August 1980, the MTDB established San Diego Trolley, Inc. to operate and maintain the new light rail system. On July 26, 1981, electric trains began operating the South Line (today's
Blue Line) between San Diego and San Ysidro.
In 1985, the city of San Diego transferred control of the San Diego Transit Corporation to the MTDB. The MTDB also coordinated transit services operated by San Diego County and other local agencies. Starting in 1986, all of these services begin operating under a single brand, the San Diego Metropolitan Transit System.
The San Diego Trolley added a second line on March 23, 1986 by redeveloping the La Mesa Branch of the SD&AE into the East Line (today's
Orange Line).
This line was extended to
El Cajon by June 23, 1989.
Service was expanded beyond the old SD&AE right-of-way when the line was extended further east to
Santee on August 26, 1995.
The East Line's Bayside extension to the
Convention Center and
Gaslamp Quarter
The Gaslamp Quarter is a 16½-block neighborhood in the downtown area of San Diego, California. It extends from Broadway to Harbor Drive, and from 4th to 6th Avenue.
Listed as a historic district on the National Register of Historic Places as ...
opened on June 30, 1990.
Later in the decade, the South Line was extended to the north, reaching
Little Italy on July 2, 1992,
Old Town on June 16, 1996,
and
Mission San Diego
Mission (from Latin ''missio'' "the act of sending out") may refer to:
Organised activities Religion
* Christian mission, an organized effort to spread Christianity
*Mission (LDS Church), an administrative area of The Church of Jesus Christ of ...
on November 23, 1997. At that the same time, the South Line and East Line of the system were renamed the Blue Line and the Orange Line, respectively.

One of the system's most ambitious expansions opened on July 10, 2005. The Mission Valley East extension built the only underground station in the system at
San Diego State University
San Diego State University (SDSU) is a public research university in San Diego, California. Founded in 1897 as San Diego Normal School, it is the third-oldest university and southernmost in the 23-member California State University (CSU) syste ...
and inaugurated the third route in the San Diego Trolley system, the
Green Line
Green Line may refer to:
Places Military and political
* Green Line (France), the German occupation line in France during World War II
* Green Line (Israel), the 1949 armistice line established between Israel and its neighbours
** City Line ( ...
.
On January 1, 2003, the state consolidated the planning, development, and construction functions of the MTDB and the
North San Diego County Transit Development Board
The North County Transit District (typically abbreviated as NCTD) is the agency responsible for public transportation in Northern San Diego County, California. The agency manages the COASTER commuter rail service between Oceanside and San Die ...
into the
San Diego Association of Governments (SANDAG) to create a consolidated regional transportation planning and development agency.
With the San Diego Metropolitan Transit Development Board no longer in charge of developing future transit projects, the MTDB changed its name to the Metropolitan Transit System (MTS) in 2005.
Modern history
In 2007, MTS completed a "Comprehensive Operational Analysis" that redesigned the area's bus network for the first time in 23 years. National City was reluctant to implement the findings of the analysis and instead opts to transfer control of its National City Transit system into MTS.
The major overhaul of the San Diego Trolley called the "
Trolley Renewal Project" began in 2010. Over the next five years, all Trolley stations were renovated, making them capable of handling low-floor light rail vehicles that eliminate the stairs into the trains and allow faster boarding for people using wheelchairs. The renovations allow the Green Line to be extended to Downtown in 2012. Low-floor vehicles start operating on the Orange Line in 2013 and on the Blue Line in 2015.
In 2011, MTS opened the
Silver Line, which operates renovated
PCC streetcar
The PCC (Presidents' Conference Committee) is a streetcar (tram) design that was first built in the United States in the 1930s. The design proved successful in its native country, and after World War II it was licensed for use elsewhere in the ...
s around Downtown San Diego in partnership with the San Diego historic streetcar society.
SDMTS introduced its network of
bus rapid transit
Bus rapid transit (BRT), also called a busway or transitway, is a bus-based public transport system designed to have much more capacity, reliability and other quality features than a conventional bus system. Typically, a BRT system includes ...
routes in June 2014.
The lines operate on exclusive roadways,
dedicated lanes,
high-occupancy vehicle lane
A high-occupancy vehicle lane (also known as an HOV lane, carpool lane, diamond lane, 2+ lane, and transit lane or T2 or T3 lanes) is a restricted traffic lane reserved for the exclusive use of vehicles with a driver and one or more passengers, ...
s, and in mixed-traffic with other vehicles.
In 2016, the San Diego Trolley began construction of the Mid-Coast Corridor Transit Project. It is an extension of the Blue Line from the Old Town Transit Center north to
La Jolla Village
La Jolla Village is a mixed residential/business neighborhood in the coastal San Diego community of La Jolla. La Jolla Village Square and The Shops at La Jolla Village are in the center of the neighborhood and contain a variety of stores, resta ...
,
University of California, San Diego
The University of California, San Diego (UC San Diego or colloquially, UCSD) is a public university, public Land-grant university, land-grant research university in San Diego, California. Established in 1960 near the pre-existing Scripps Insti ...
and
University City. Ridership is projected at 34,700 trips in 2030.
The extension was completed and opened for service on November 21, 2021,
costing $2.1 billion.
Divisions
San Diego Trolley

The MTS Rail Operations division oversees the
San Diego Trolley
The San Diego Trolley is a light rail system operating in the metropolitan area of San Diego. It is known colloquially as "The Trolley". The Trolley's operator, San Diego Trolley, Inc. (SDTI), is a subsidiary of the San Diego Metropolitan Tr ...
(colloquially known as "The Trolley") a system of
light rail routes: the
Blue Line, the
Green Line
Green Line may refer to:
Places Military and political
* Green Line (France), the German occupation line in France during World War II
* Green Line (Israel), the 1949 armistice line established between Israel and its neighbours
** City Line ( ...
, the
Orange Line, and the
Silver Line, which operates using
heritage streetcars on select days. The system is operated by San Diego Trolley, Inc. (SDTI), a
subsidiary of the MTS. The Trolley began service on July 26, 1981,
making it the oldest of the
second-generation light rail systems in the United States. The entire Trolley network is with 53 stations. In 2019, the Trolley had the
5th highest ridership of light rail systems in the United States, with 38,047,300 annual rides, an average of 117,700 rides per weekday.
* The
Blue Line, which opened in 1981, operates between the
UTC Transit Center,
UC San Diego
The University of California, San Diego (UC San Diego or colloquially, UCSD) is a public land-grant research university in San Diego, California. Established in 1960 near the pre-existing Scripps Institution of Oceanography, UC San Diego is th ...
,
Downtown San Diego
Downtown San Diego is the city center of San Diego, California, the eighth largest city in the United States. In 2010, the Centre City area had a population of more than 28,000. Downtown San Diego serves as the cultural and financial center and ...
, and the international border at
San Ysidro.
* The
Orange Line, which opened in 1986, operates between Downtown San Diego and eastern suburban areas such as El Cajon and La Mesa.
* The
Green Line
Green Line may refer to:
Places Military and political
* Green Line (France), the German occupation line in France during World War II
* Green Line (Israel), the 1949 armistice line established between Israel and its neighbours
** City Line ( ...
, which opened in 2005, operates between Downtown San Diego, Old Town, Mission Valley,
San Diego State University
San Diego State University (SDSU) is a public research university in San Diego, California. Founded in 1897 as San Diego Normal School, it is the third-oldest university and southernmost in the 23-member California State University (CSU) syste ...
, El Cajon, and Santee.
* The
Silver Line, which opened in 2011, operates around Downtown San Diego on select days using
heritage streetcars.
MTS Bus Operations
The MTS Bus Operations division oversees 85 "MTS Bus" fixed-route services, nine "Rapid"
bus rapid transit
Bus rapid transit (BRT), also called a busway or transitway, is a bus-based public transport system designed to have much more capacity, reliability and other quality features than a conventional bus system. Typically, a BRT system includes ...
routes, and the "MTS Access"
paratransit
Paratransit is the term used in North America, also known by other names such as community transport ( UK) for transportation services that supplement fixed-route mass transit by providing individualized rides without fixed routes or timetables. ...
service. Routes are operated by private contractors and by the San Diego Transit Corporation (SDTC), a subsidiary of the MTS. The SDTC operates 27 routes based out of Downtown San Diego (Imperial Avenue Division) and
Kearny Mesa (Kearny Mesa Division),
Transdev
Transdev, formerly Veolia Transdev, is a French-based international private-sector company which operates public transport. It has operations in 17 countries and territories as of November 2020.
History
The group was formed by the merger of ...
operates 52 routes based out of
Chula Vista (South Bay Division) and
El Cajon (East County Division), while
First Transit operates the "MTS Access" paratransit service and 21 fixed-route services that are operated with
mini-buses based out of
Kearny Mesa (Copley Park Division). All buses and division facilities, even those used by contractors, are owned by the MTS.
"MTS Bus" fixed-route services

Urban bus routes link the densely populated neighborhoods and adjacent cities together with direct and frequent bus services. These services constitute the bulk of fixed-route bus services operated in terms of vehicle requirements and patronage. Typically, headways are 12–15 minutes between scheduled bus arrival/departure times during commute periods and during midday times on the busiest lines. Generally, no worse than 30-minute headways occur during non-commute periods or 60-minute headways weekends. Local routes generally have stops placed every block or every other block. Limited-stop lines have stops placed every approximately quarter to half-mile.
Five express fixed-route bus lines (Routes 20, 60, 110, 140, and 950) are operated along major roadways and highways and link intermediate distant suburban areas to the San Diego urban area. Two of the six express lines (Routes 60 and 110) only operate during the morning and evening weekday commute periods.
Rural transit services (Routes 888, 891, 892 and 894) link the sparsely populated central and eastern portions of San Diego County to the San Diego Trolley and other fixed-route transit services at the
El Cajon Transit Center. These lines offer much less frequent service – Route 888 only operates on Mondays and Fridays, Route 891 on Fridays, and Route 892 on Thursdays. Only Route 894 operates Mondays through Fridays.
"Rapid" bus rapid transit service
Rapid
Rapids are sections of a river where the river bed has a relatively steep gradient, causing an increase in water velocity and turbulence.
Rapids are hydrological features between a ''run'' (a smoothly flowing part of a stream) and a ''cascade ...
is a network of nine
bus rapid transit
Bus rapid transit (BRT), also called a busway or transitway, is a bus-based public transport system designed to have much more capacity, reliability and other quality features than a conventional bus system. Typically, a BRT system includes ...
(BRT) routes in the San Diego area. The lines operate on exclusive roadways,
dedicated lanes,
high-occupancy vehicle lane
A high-occupancy vehicle lane (also known as an HOV lane, carpool lane, diamond lane, 2+ lane, and transit lane or T2 or T3 lanes) is a restricted traffic lane reserved for the exclusive use of vehicles with a driver and one or more passengers, ...
s, and in mixed-traffic with other vehicles.
* Routes 201, 202 and 204 offer frequent service in the
University City and
La Jolla Village
La Jolla Village is a mixed residential/business neighborhood in the coastal San Diego community of La Jolla. La Jolla Village Square and The Shops at La Jolla Village are in the center of the neighborhood and contain a variety of stores, resta ...
areas near the
University of California, San Diego
The University of California, San Diego (UC San Diego or colloquially, UCSD) is a public university, public Land-grant university, land-grant research university in San Diego, California. Established in 1960 near the pre-existing Scripps Insti ...
. Initial service began in June 2009, with an extension in March 2013.
* Route 215 offers frequent service between
San Diego State University
San Diego State University (SDSU) is a public research university in San Diego, California. Founded in 1897 as San Diego Normal School, it is the third-oldest university and southernmost in the 23-member California State University (CSU) syste ...
and Downtown San Diego, using dedicated lanes on Park and
El Cajon Boulevards to speed travel times. It opened for service in October 2014.
* Route 225 offers frequent service between the
Otay Mesa Port of Entry,
Chula Vista, and Downtown San Diego, using the high-occupancy vehicle lanes of
Interstate 805 and an exclusive roadway along East Palomar Street and in the
Otay Ranch neighborhood to speed travel times. Initial service began in September 2018, with an extension in January 2019.
* Route 235 offers frequent service between
Escondido and Downtown San Diego, using the high-occupancy vehicle lanes of
Interstate 15
Interstate 15 (I-15) is a major Interstate Highway in the western United States, running through Southern California and the Intermountain West. I-15 begins near the Mexican border in San Diego County and stretches north to Alberta, Cana ...
, with dedicated ramps to transit centers, to speed travel times. It opened for service in June 2014.
* Route 237 offers limited service between the University of California, San Diego's "Gilman Transit Center" (with connections to the 201 and 202 above) and
Miramar College. Route 237 operates during peak hours only and travels in mixed-traffic with other vehicles. It opened for service in October 2014.
* Route 280 offers limited, express service between Escondido and Downtown San Diego, using the high-occupancy vehicle lanes of Interstate 15, with a dedicated ramp to the Del Lago Transit Station, to speed travel times. The route operates during peak hours only. It opened for service in June 2014.
* Route 290 offers limited, express service between Rancho Bernardo and Downtown San Diego, using the high-occupancy vehicle lanes of Interstate 15, with dedicated ramps to transit centers, to speed travel times. The route operates during peak hours only. It opened for service in June 2014.
"MTS Access" paratransit service
Paratransit services, operated under the name "MTS Access," provide point-to-point service upon request to passengers registered with MTS as being qualified for assistance under the
Americans with Disabilities Act
The Americans with Disabilities Act of 1990 or ADA () is a civil rights law that prohibits discrimination based on disability. It affords similar protections against discrimination to Americans with disabilities as the Civil Rights Act of 19 ...
. Service is available throughout the MTS service area, and connections to a similar NCTD service are also available. Vehicles are typically mini-buses equipped with
wheelchair lifts and tie-downs.
San Diego and Arizona Eastern Railway
The
San Diego and Arizona Eastern Railway (SD&AE) is a subsidiary of the MTS that manages and leases railroad tracks for freight service. The
San Diego and Imperial Valley Railroad
The San Diego and Imperial Valley Railroad (SD&IV) is a class III railroad operating freight rail service in the San Diego area, providing service to customers in the region and moving railcars between the end of the BNSF Railway in Downtown Sa ...
has exclusive
trackage rights
Railway companies can interact with and control others in many ways. These relationships can be complicated by bankruptcies.
Operating
Often, when a railroad first opens, it is only a short spur of a main line. The owner of the spur line may c ...
move railcars from the end of the
BNSF Railway in Downtown San Diego to either industrial customers in the San Diego area or to the
Mexico–United States border
The Mexico–United States border ( es, frontera Estados Unidos–México) is an international border separating Mexico and the United States, extending from the Pacific Ocean in the west to the Gulf of Mexico in the east. The border trav ...
in San Ysidro over the SD&AE Main Line and La Mesa Branch. The
Baja California Railroad holds the right to operate over the SD&AE Desert Line in the
Imperial Valley
, photo = Salton Sea from Space.jpg
, photo_caption = The Imperial Valley below the Salton Sea. The US-Mexican border runs diagonally across the lower left of the image.
, map_image = Newriverwatershed-1-.jpg
, map_caption = Map of Imperial ...
.
For-Hire Vehicle Administration
The For-Hire Vehicle Administration division licenses and regulates
taxicab
A taxi, also known as a taxicab or simply a cab, is a type of vehicle for hire with a driver, used by a single passenger or small group of passengers, often for a non-shared ride. A taxicab conveys passengers between locations of their choi ...
s,
jitneys, non-emergency
patient transport services, and other private for-hire passenger transportation services provided by contract in the cities of San Diego,
El Cajon,
Imperial Beach,
La Mesa,
Lemon Grove,
Poway and
Santee.
Governance
MTS is a
joint powers authority agency, or JPA. Member cities include San Diego,
Chula Vista,
Coronado,
El Cajon,
Imperial Beach,
La Mesa,
Lemon Grove,
National City,
Poway,
Santee, and
San Diego County
San Diego County (), officially the County of San Diego, is a county in the southwestern corner of the U.S. state of California. As of the 2020 census, the population was 3,298,634, making it California's second-most populous county and the f ...
. Elected officials from each jurisdiction, including
San Diego County
San Diego County (), officially the County of San Diego, is a county in the southwestern corner of the U.S. state of California. As of the 2020 census, the population was 3,298,634, making it California's second-most populous county and the f ...
, serve as the Board of Directors.
The city of San Diego has the most representation with four members.
A county resident is elected by the Board of Directors to serve as the Chairman.
See also
*
Transportation in San Diego County
References
External links
*
Southern Area System MapNCTD System MapMTS Historical TimelineList of MTS bus routes
{{Public Transportation in Greater San Diego
Public transportation in San Diego County, California
Transportation in San Diego
Bus transportation in California
Passenger rail transportation in California
Intermodal transportation authorities in California
1886 establishments in California
Transit authorities with natural gas buses