Light-rail systems are typically designed to carry fewer passengers than heavy-rail systems like commuter rail or rapid transit (subway). They can operate in mixed traffic (street running) or on routes that are not entirely grade-separated.
They typically take one of four forms: "first-generation" legacy systems, "second-generation" modern light-rail systems, streetcars, and hybrid rail systems (light rail with some commuter-rail features). All use similar technologies, and some systems blur the lines between the different forms.
From the mid-19th century onwards, horse-drawn trams (or horsecars) were used in cities around the world. The St. Charles Avenue Line of New Orleans' streetcar system is the oldest continuously operating street railway system in the world, beginning operation as a horse-drawn system in 1835.[3]
In the late 1880s, electrically powered street railways became technically feasible with the invention of a trolley pole system of collecting current. American inventor Frank J. Sprague installed the first successful electrified trolley system in Richmond, Virginia, in 1888. Before the invention of the internal combustion engine and the advent of motor-buses, they were the only practical means of public transport around cities.[4]
The streetcar systems constructed in the 19th and early 20th centuries typically ran single-car setups. Some rail lines experimented with multiple-unit configurations, joining streetcars to make short trains, but this did not become common until later. When lines were built over longer distances (typically with a single track) before good roads were common, they were generally called interurban streetcars or radial railways in North America.
Historically, the rail gauge has had considerable variations, with a variety of gauges common in many early systems (e.g. the broad Pennsylvania trolley gauge, etc. used by New Orleans' streetcars and by the light rail systems in Philadelphia and Pittsburgh). However, most modern second-generation light rail systems now operate on standard gauge rail.[5]
After World War II, six major cities in the United States (Boston, Newark, New Orleans, Philadelphia, Pittsburgh, San Francisco) continued to operate large first-generation streetcar systems, although most of them were later converted to modern light rail standards.[6] Toronto in Canada marks the other city in North America with a continuing first-generation streetcar system. Additionally, a seventh American city, Cleveland, maintained an interurban system (e.g. the Blue and Green Lines) equivalent to what is now "light rail", that opened before World War I, and which is still in operation to this day.[6]
When several of these cities upgraded to new technology (e.g. San Francisco, Newark, and Pittsburgh), they called it "light rail" to differentiate it from their existing streetcar systems since some continued to operate portions of both the old and new systems.
In the United States, most of the original first-generation streetcar systems were decommissioned from the 1950s onward through approximately 1970 as the usage of the automobile increased through government policy.
Although a few traditional streetcar or trolley systems still exist to this day the term "light rail" has come to mean a different type of rail system. Modern light rail technology has primarily German origins, since an attempt by Boeing Vertol to introduce a new American light rail vehicle was a technical failure. After World War II, the Germans retained their streetcar (Straßenbahn) networks and evolved them into model light rail systems (Stadtbahn).[5]
The renaissance of light rail in the United States began in 1981, when the first truly second-generation light rail system was inaugurated in the United States, the San Diego Trolley in California, which adopted use of the German Siemens-Duewag U2 light rail vehicle. (This was just three years after the first North American second-generation light rail system opened in the Canadian city of Edmonton, Alberta in 1978, and which used the same German Siemens-Duewag U2 vehicles as San Diego).[6] Other North American cities, particularly on the West Coast, began planning their own light rail systems in the 1980s.[7]
As of March2020[update], there are a total of 53 operational light rail-type lines and systems (noting that some cities, such as Philadelphia, Portland, San Francisco and Seattle, have more than one light rail system) that offer regular year-round transit service in the United States: 26 modern light rail systems,[8] 14 modern streetcar systems, and 13 heritage streetcar systems (including the San Francisco cable car system).
"First-generation" legacy systems
First-generation systems are typically vestigial elements of sprawling streetcar systems decommissioned between the 1950s and about 1970. These elements were generally preserved because of their high ridership and some exclusive right of way.[6] Many have been at least partly upgraded to more closely resemble the more modern second-generation light rail systems.
While changes were made to the original 1897 Tremont Street subway in 1962 and 2004, and to some of the line routes over the years, and the Green Line's streetcar A branch was closed in 1969, both systems have run intact with mostly uninterrupted service since their opening dates.
Aside from line and station renovations in the early 1980s, and the Waterfront extension in 1996, these lines have operated essentially uninterrupted as light rail (interurbans) from their opening.
The St. Charles Avenue Line is the oldest continuously operating street railway system in the world, beginning operation as a horse-drawn system in 1835; the line was electrified in 1893. Three additional lines built to more modern standards have been added since 1988.
The subway–surface trolley lines began operation as a mixed subway/streetcar system in 1906, and have continued operation essentially unchanged since that time.
SEPTA Routes 101 & 102 (the Media-Sharon Lines) began operation as rail lines in mostly exclusive rights-of-way (light rail) in 1906, and have also operated mostly unchanged since then.
SEPTA Route 15 (the Girard Avenue Line) started as a horse car line, electrified in 1895. It was replaced with buses in 1992, but service on the line with heritage streetcars resumed in 2005.
Began as a streetcar network, but was partially converted to light rail. By the 1970s, most routes were converted to bus, and the remaining streetcar lines (all of which still used the 1904 Mt. Washington Transit Tunnel) were converted to light rail. This included the construction of a new 1.1 miles (1.8km) downtown tunnel. The converted system partially opened for service in 1984.
World's last manually operated cable car system. Of the 23 lines established between 1873 and 1890, only three remain. While the cable cars are used to a certain extent by commuters, the vast majority of their seven million annual passengers are tourists.
Began as a streetcar network, but was partially converted to light rail. While most of San Francisco's original streetcar lines had been converted to buses, five lines with dedicated rights-of-way could not be converted. The streetcars were partially converted to light rail in 1980, sending the lines into the Market Street subway. The lines still operate as streetcars on surface streets. The T Third Street and S Shuttle lines added later are true light rail.
Established in 1982 during a closure of the cable car system for refurbishment, to provide an alternative tourist attraction. Streetcars operated on the Market Street tracks recently abandoned by the streetcar lines that became the Muni Metro. Service proved popular and was retained and expanded.
"Second-generation" modern systems
Inspired by the German Stadtbahn (English: city rail) systems,[5] the second generation of modern light rail systems generally have large multi-car trains that travel larger distances, make fewer stops, and run at least partly on exclusive rights-of-way.[10][11] The first was the San Diego Trolley, which opened in 1981.
Modern streetcar systems generally have smaller single-car trains that travel on short routes with frequent stops in lanes that are shared with automobile traffic (street running). The first was the Portland Streetcar, which opened in 2001. Some are heritage streetcar lines, which run vintage or historic-replica vehicles.
Hybrid rail systems, routes operating on the national rail network which do not operate with commuter rail characteristics, were introduced in 2004 with New Jersey's River Line. Hybrid rail systems operate vehicles which do not meet Federal Railroad Administration (FRA) guidelines, usually (but not always) small multiple unit railcars like a light rail system, but like commuter rail, they are typically powered by diesel engines over tracks which may be shared with freight trains (which typically only operate overnight, when passenger service has stopped).[78] Unlike most commuter rail systems which only operate during the weekday peak travel periods, hybrid rail systems operate all-day, every day, but typically at longer headways than light rail.
The following table lists entirely new light rail, streetcar, or hybrid rail systems under construction.[85] Systems that are in the planning stages but not yet under construction (e.g. Glassboro–Camden Line, Interborough Express, and the Austin CapMetro RailProject Connect system), are not listed; expansions of existing systems are also not listed here.
Light rail is a form of passenger urban rail transit that uses rolling stock derived from tram technology while also having some features from heavy rapid transit.
The Portland Streetcar is a streetcar system in Portland, Oregon, that opened in 2001 and serves areas surrounding downtown Portland. The 3.9-mile (6.3 km) NS Line runs from Northwest Portland to the South Waterfront via Downtown and the Pearl District. The Loop Service, which opened in September 2012 as the Central Loop, runs from Downtown to the Oregon Museum of Science and Industry via the Pearl District, the Broadway Bridge across Willamette River, the Lloyd District, and the Central Eastside Industrial District and added 3.3 miles (5.3 km) of route. In September 2015 the line was renamed as the Loop Service, with the A Loop traveling clockwise, and the B Loop traveling counterclockwise. The two-route system serves some 20,000 daily riders.
Dallas Area Rapid Transit (DART) is a transit agency serving the Dallas–Fort Worth metroplex of Texas. It operates buses, light rail, commuter rail, and high-occupancy vehicle lanes in Dallas and twelve of its suburbs. In 2023, the system had a ridership of 50,463,300, or about 167,100 per weekday as of the third quarter of 2024.
The Willamette Shore Trolley is a heritage railroad or heritage streetcar that operates along the west bank of the Willamette River between Portland and Lake Oswego in the U.S. state of Oregon. The right-of-way is owned by a group of local-area governments who purchased it in 1988 in order to preserve it for potential future rail transit. Streetcar excursion service began operating on a trial basis in 1987, lasting about three months, and regular operation on a long-term basis began in 1990. The Oregon Electric Railway Historical Society has been the line's operator since 1995.
Brookville Equipment Corporation, based in Brookville, Pennsylvania, United States, manufactures railroad locomotives for industrial and light capacity switching needs. The company also builds and restores streetcars. The company used to be known as Brookville Locomotive Company.
TRAX is a light rail system in the Salt Lake Valley of Utah, in the United States, serving Salt Lake City and many of its suburbs throughout Salt Lake County. The system's official name, Transit Express, is rarely, if ever, used. The system is operated by the Utah Transit Authority (UTA). All TRAX trains are electric, receiving power from overhead wires.
The San Diego Trolley is a light rail system serving San Diego County, California. The trolley's operator, San Diego Trolley, Inc., is a subsidiary of the San Diego Metropolitan Transit System (MTS). The trolley operates as a critical component of MTS, with connections to and integrated travel tickets with the local bus systems.
Various terms are used for passenger railway lines and equipment; the usage of these terms differs substantially between areas:
The SEPTA subway–surface trolley lines are a collection of five SEPTA trolley lines that operate on street-level tracks in West Philadelphia and Delaware County, Pennsylvania, and also underneath Market Street in Philadelphia's Center City. The lines, Routes 10, 11, 13, 34, and 36, collectively operate on about 39.6 miles (63.7 km) of route.
The Siemens S70 and its successor, the Siemens S700, are a series of articulated low-floor light-rail vehicles (LRV) and modern streetcars manufactured for the United States market by Siemens Mobility, a division of German conglomerate Siemens AG. The series also includes a European tram-train variant, the Siemens Avanto.
The M-Line Trolley is a heritage streetcar line in the Uptown neighborhood of Dallas, Texas. The trolley line, which has been in service since 1989, is notable for its use of restored historic streetcar vehicles, as opposed to modern replicas.
Light rail is a commonly used mode of public transit in North America. The term light rail was coined in 1972 by the Urban Mass Transportation Administration to describe new streetcar transformations which were taking place in Europe and the United States. The Germans used the term Stadtbahn, which is the predecessor to North American light rail, to describe the concept, and many in UMTA wanted to adopt the direct translation, which is city rail. However, in its reports, UMTA finally adopted the term light rail instead.
Streetcars or trolley(car)s were once the chief mode of public transit in hundreds of North American cities and towns. Most of the original urban streetcar systems were either dismantled in the mid-20th century or converted to other modes of operation, such as light rail. Today, only Toronto still operates a streetcar network essentially unchanged in layout and mode of operation.
The MATA Trolley is a heritage streetcar transit system in Memphis, Tennessee. It began operating on April 29, 1993. Service was suspended in June 2014, following fires on two cars. After nearly four years and repeated postponements, the reopening of the Main Street Line took place on April 30, 2018, while the system's two other lines remained suspended, but with reopening of both planned. However, all service was suspended again in August 2024 in response to a recommendation by the state department of transportation after an issue arose with braking of the trolley cars. In 2023, the system had a ridership of 365,400.
↑ "METRO About Us". Metropolitan Transit Authority of Harris County, Houston, Texas. Archived from the original on June 24, 2013. Retrieved July 23, 2013.
↑ "FY2012 Business Plan & Budget"(PDF). Metropolitan Transit Authority of Harris County, Houston, Texas. 2012. Archived from the original(PDF) on September 18, 2013. Retrieved August 10, 2013.
↑ "METRORail Rider Guide"(PDF). Metropolitan Transit Authority of Harris County, Houston, Texas. December 22, 2013. Archived from the original(PDF) on March 30, 2014. Retrieved January 8, 2014.
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