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Light rail
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Los Angeles' expansion of mass transit has been driven in large part by light rail.
Light rail, light rail transit (LRT), or fast tram is a form of urban rail transport using rolling stock similar to a tramway, but operating at a higher capacity, and often on an exclusive right-of-way.
Utah Transit Authority's TRAX is one of the fastest growing light rail systems in the United States.
With nearly a quarter million riders served each day, Boston's MBTA Green Line is the second busiest light rail system in the United States.
There is no standard definition, but in the United States (where the terminology was devised in the 1970s from the engineering term light railway), light rail operates primarily along exclusive rights-of-way and uses either individual tramcars or multiple units coupled to form a train that is lower capacity and lower speed than a long heavy-rail passenger train or metro system.[1][2][3][4][5]
A few light rail networks tend to have characteristics closer to rapid transit or even commuter rail; some of these heavier rapid transit-like systems are referred to as light metros. Other light rail networks are tram-like in nature and partially operate on streets. Light rail systems are found throughout the world, on all inhabited continents. They have been especially popular in recent years due to their lower capital costs and increased reliability compared with heavy rail systems.
Contents
1 History
2 Definition
3 Types
3.1 Lower capacity
3.2 Higher capacity
3.3 Mixed systems
3.4 Speed and stop frequency
3.5 System-wide considerations
4 Track gauge
5 Capacity
5.1 Efficiency
5.2 Comparison with high capacity roads
5.3 Practical considerations
6 Safety
7 Construction and operation costs
8 Health impact
9 Integration with bicycles
10 Variations
10.1 Trams operating on mainline railways
10.2 Third-rail power for trams
11 Comparison to other rail transit modes
11.1 Typical rolling stock
11.2 Train operation
11.3 Floor height
11.4 Power sources
12 Tram and other light rail transit systems worldwide
13 See also
14 References
15 External links
History
Streetcar built by Preston Car Company in Ontario[6]
Many original tram and streetcar systems in the United Kingdom, United States, and elsewhere were decommissioned starting in the 1950s as the popularity of the automobile increased. Britain abandoned its last tram system, except for Blackpool, by 1962.[7] Although some traditional trolley or tram systems exist to this day, the term "light rail" has come to mean a different type of rail system. Modern light rail technology has primarily West 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 many of their streetcar networks and evolved them into model light rail systems (Stadtbahnen). Except for Hamburg, all large and most medium-sized German cities maintain light rail networks.[8]
The basic concepts of light rail were put forward by H. Dean Quinby in 1962 in an article in Traffic Quarterly called "Major Urban Corridor Facilities: A New Concept". Quinby distinguished this new concept in rail transportation from historic streetcar or tram systems as:
- having the capacity to carry more passengers
- appearing like a train, with more than one car connected together
- having more doors to facilitate full utilization of the space
- faster and quieter in operation
The term light rail transit (LRT) was introduced in North America in 1972 to describe this new concept of rail transportation.[9]
The first of the new light rail systems in North America began operation in 1978 when the Canadian city of Edmonton, Alberta, adopted the German Siemens-Duewag U2 system, followed three years later by Calgary, Alberta, and San Diego, California. The concept proved popular, and although Canada has few cities big enough for light rail, there are now at least 30 light rail systems in the United States.
Britain began replacing its run-down local railways with light rail in the 1980s, starting with the Tyne and Wear Metro and followed by the Docklands Light Railway (DLR) in London. The historic term light railway was used because it dated from the British Light Railways Act 1896, although the technology used in the DLR system was at the high end of what Americans considered to be light rail. The trend to light rail in the United Kingdom was firmly established with the success of the Manchester Metrolink system in 1992.
Definition
Edmonton Light Rail Transit in Edmonton, Alberta, Canada, was the first modern LRT line in North America
The MetroLink light rail in St. Louis, Missouri, United States
The Buenos Aires Premetro, built in 1987
The term light rail was coined in 1972 by the U.S. Urban Mass Transportation Administration (UMTA; the precursor to the Federal Transit Administration) to describe new streetcar transformations that were taking place in Europe and the United States. In Germany the term Stadtbahn (to be distinguished from S-Bahn, which stands for Stadtschnellbahn) was used to describe the concept, and many in UMTA wanted to adopt the direct translation, which is city rail (the Norwegian term, bybane, means the same). However, UMTA finally adopted the term light rail instead.[10]Light in this context is used in the sense of "intended for light loads and fast movement", rather than referring to physical weight. The infrastructure investment is also usually lighter than would be found for a heavy rail system.
The Transportation Research Board (Transportation Systems Center) defined "light rail" in 1977 as "a mode of urban transportation utilizing predominantly reserved but not necessarily grade-separated rights-of-way. Electrically propelled rail vehicles operate singly or in trains. LRT provides a wide range of passenger capabilities and performance characteristics at moderate costs."
The American Public Transportation Association (APTA), in its Glossary of Transit Terminology, defines light rail as:
...a mode of transit service (also called streetcar, tramway, or trolley) operating passenger rail cars singly (or in short, usually two-car or three-car, trains) on fixed rails in right-of-way that is often separated from other traffic for part or much of the way. Light rail vehicles are typically driven electrically with power being drawn from an overhead electric line via a trolley [pole] or a pantograph; driven by an operator on board the vehicle; and may have either high platform loading or low level boarding using steps."[1]
However, some diesel-powered transit is designated light rail, such as the O-Train Trillium Line in Ottawa, Ontario, Canada, the River Line in New Jersey, United States, and the Sprinter in California, United States, which use diesel multiple unit (DMU) cars.
Light rail is similar to the British English term light railway, long-used to distinguish railway operations carried out under a less rigorous set of regulation using lighter equipment at lower speeds from mainline railways. Light rail is a generic international English phrase for these types of rail systems, which means more or less the same thing throughout the English-speaking world.
The use of the generic term light rail avoids some serious incompatibilities between British and American English. The word tram, for instance, is generally used in the UK and many former British colonies to refer to what is known in North America as a streetcar, but in North America tram can instead refer to an aerial tramway,[11] or, in the case of the Disney amusement parks, even a land train.[12] (The usual British term for an aerial tramway is cable car, which in the US usually refers to a ground-level car pulled along by subterranean cables.) The word trolley is often used as a synonym for streetcar in the United States, but is usually taken to mean a cart, particularly a shopping cart, in the UK and elsewhere.[13] Many North American transportation planners reserve streetcar for traditional vehicles that operate exclusively in mixed traffic on city streets, while they use light rail to refer to more modern vehicles operating mostly in exclusive rights of way, since they may operate both side-by-side targeted at different passenger groups.[14]
The difference between British English and American English terminology arose in the late 19th century when Americans adopted the term "street railway", rather than "tramway", with the vehicles being called "streetcars" rather than "trams". Some have suggested that the Americans' preference for the term "street railway" at that time was influenced by German emigrants to the United States[15] (who were more numerous than British immigrants in the industrialized Northeast), as it is the same as the German term for the mode, Straßenbahn (meaning "street railway"). A further difference arose because, while Britain abandoned all of its trams except Blackpool after World War II, eight major North American cities (Toronto, Boston, Philadelphia, San Francisco, Pittsburgh, Newark, Cleveland, and New Orleans) continued to operate large streetcar systems.[16] When these cities upgraded to new technology, they called it light rail to differentiate it from their existing streetcars since some continued to operate both the old and new systems. Since the 1980s, Portland, Oregon, has built all three types of system: a high-capacity light rail system in dedicated lanes and rights-of-way, a low-capacity streetcar system integrated with street traffic, and an aerial tram system.
SEPTA's 101 trolley pulling into 69th Street Terminal near Philadelphia
The opposite phrase heavy rail, used for higher-capacity, higher-speed systems, also avoids some incompatibilities in terminology between British and American English, as for instance in comparing the London Underground and the New York City Subway. Conventional rail technologies including high-speed, freight, commuter/regional, and metro/subway/elevated urban transit systems are considered "heavy rail". People movers and personal rapid transit are even "lighter," at least in terms of capacity. Monorail is a separate technology that has been more successful in specialized services than in a commuter transit role.
Types
Metrolink in Manchester city centre, England, is an example of street-level light rail
The Docklands Light Railway in London, England, is an example of light rail separated from road traffic.
The Tranvia de Tenerife (Tenerife, Spain) includes some operation at street level, but separated from other traffic
Due to varying definitions, it is hard to distinguish between what is called light rail, and other forms of urban and commuter rail. A system described as light rail in one city may be considered to be a streetcar or tram system in another. Conversely, some lines that are called "light rail" are in fact very similar to rapid transit; in recent years, new terms such as light metro have been used to describe these medium-capacity systems. Some "light rail" systems, such as Sprinter, bear little similarity to urban rail, and could alternatively be classified as commuter rail or even inter-city rail. In the United States, "light rail" has become a catch-all term to describe a wide variety of passenger rail systems.
There is a significant difference in cost between these different classes of light rail transit. Tram-like systems are often less expensive than metro-like systems by a factor of two or more.
Lower capacity
The most difficult distinction to draw is that between light rail and streetcar or tram systems. There is a significant amount of overlap between the technologies, many of the same vehicles can be used for either, and it is common to classify streetcars or trams as a subcategory of light rail rather than as a distinct type of transportation. The two general versions are:
- The traditional type, where tracks and trains run along the streets and share space with road traffic. Stops tend to be very frequent, but little effort is made to set up special stations. Because space is shared, the tracks are usually visually unobtrusive.
- A more modern variation, where the trains tend to run along their own right-of-way, separated from road traffic. Stops are generally less frequent, and the vehicles are often boarded from a platform. Tracks are highly visible, and in some cases significant effort is expended to keep traffic away through the use of special signaling, level crossings with gate arms, or even a complete separation with non-level crossings.
Higher capacity
Sydney's Dulwich Hill Line is mostly situated on segregated tracks along a former heavy rail corridor
At the highest degree of separation, it can be difficult to draw the line between light rail and metros, as in the case of Wuppertal's Schwebebahn hanging rail system, the "D" Branch of Boston's Green Line, Ottawa's Confederation Line, or London's Docklands Light Railway which would likely not be considered "light" were it not for the contrast between it and the London Underground. These may be considered to be light metro lines rather than "light rail" lines. In Europe, however, the term light rail is increasingly used to describe any rapid transit system with a fairly low frequency or short trains compared to heavier mass rapid systems such as the London Underground or Singapore's Mass Rapid Transit. For instance, the LRT-1 and MRT-3 in Manila are often referred to as "light rail", despite being fully segregated, mostly elevated railways. This phenomenon is quite common in Chinese cities, where elevated light metro（or even metro,in this case Shanghai metro line 3, operating with 6-car trains） lines in Shanghai, Wuhan, and Dalian are called light rail lines. In North America, such systems are not usually considered light rail（with the exception of Scarborough LRT in Toronto）.
Mixed systems
Many systems have mixed characteristics. Indeed, with proper engineering, a rail line could run along a street, then go underground, and then run along an elevated viaduct. For example, the Los Angeles Metro Rail's Gold Line "light rail" has sections that could alternatively be described as a tramway, a light metro, and, in a narrow sense, rapid transit. This is especially common in the United States, where there is not a popularly perceived distinction between these different types of urban rail systems.
It is even possible to have high-floor rapid transit cars run along a street, like a tram; this is known as street running.
Speed and stop frequency
In some areas, "light rail" may also refer to any rail line with frequent low speeds or many stops in a short distance. This inherits the old definition of light railway in the UK. Hong Kong's Light Rail is an example of this[citation needed], although it is also called "light rail" because it is a lower-scale system than the rest of the MTR. Sprinter in the San Diego area uses DMUs and is targeted towards a commuter rail audience; however, because of the large number of stops along the line, it is called light rail.
Reference speed from major light rail systems, including station stop time, is shown below.[17]
| System | Average speed (mph) |
|---|---|
| Baltimore | 24 |
| Dallas (Red Line) | 21 |
| Dallas (Blue Line) | 19 |
| Denver (Alameda-Littleton) | 38 |
| Denver (Downtown-Littleton) | 26 |
| Los Angeles (Blue Line) | 24 |
| Los Angeles (Green Line) | 38 |
| Salt Lake City | 24 |
However, low top speed is not always a differentiating characteristic between light rail and other systems. For example, the Siemens S70 LRVs used in the Houston METRORail and other North American LRT systems have a top speed of 106 kilometres per hour (66 mph) while the trains on the all-underground Montreal Metro can only reach a top speed of 72 kilometres per hour (45 mph). Los Angeles Metro light rail vehicles have higher top and average speeds than Montreal Metro or New York City Subway trains.[18] The main difference is that Montreal Metro and New York City Subway trains carry far more passengers than any North American LRT system, and the trains have faster acceleration, making station-to-station times relatively short in their densely populated urban areas. Most light rail systems serve less densely populated cities and suburbs where passenger traffic is not high, but low cost combined with high top speed may be important to compete with automobiles.
System-wide considerations
Many light rail systems—even fairly old ones—have a combination of both on- and off-road sections. In some countries (especially in Europe), only the latter is described as light rail. In those places, trams running on mixed rights-of-way are not regarded as light rail, but considered distinctly as streetcars or trams. However, the requirement for saying that a rail line is "separated" can be quite low—sometimes just with concrete "buttons" to discourage automobile drivers from getting onto the tracks. Some systems such as Seattle's Link are truly mixed but closed to traffic, with light rail vehicles and traditional buses both operating along a common right-of-way.
Some systems, such as the AirTrain JFK in New York City, the DLR in London, and Kelana Jaya Line in Kuala Lumpur, Malaysia, have dispensed with the need for an operator. The Vancouver SkyTrain was an early adopter of driverless vehicles, while the Toronto Scarborough rapid transit operates the same trains as Vancouver, but uses drivers. In most discussions and comparisons, these specialized systems are generally not considered light rail.
Track gauge
Historically, the track gauge has had considerable variations, with narrow gauge common in many early systems. However, most light rail systems are now standard gauge.[8] Older standard-gauge vehicles could not negotiate sharp turns as easily as narrow-gauge ones, but modern light rail systems achieve tighter turning radii by using articulated cars. An important advantage of standard gauge is that standard railway maintenance equipment can be used on it, rather than custom-built machinery. Using standard gauge also allows light rail vehicles to be moved around, conveniently using the same tracks as freight railways. Another factor favoring standard gauge is that accessibility laws are making low-floor trams mandatory, and there is generally insufficient space for wheelchairs to move between the wheels in a narrow-gauge layout. Furthermore, standard-gauge rolling stock can be switched between networks either temporarily or permanently and both newly built and used standard-gauge rolling stock tends to be cheaper to buy, as more companies offer such vehicles.
Capacity
A Crystal Mover LRT train on boarding
Efficiency
Energy efficiency for light rail may be 120 passenger miles per gallon of fuel (or equivalent), but variation is great, depending on circumstances.[19]
Comparison with high capacity roads
While the table above compares the maximum capacity of each mode, the average use of a lane might be quite different, based on a number of factors. One line of light rail (requires 25' Right of Way) has a theoretical capacity of up to 8 times more than one 12' lane of freeway (not counting buses) during peak times. Roads have ultimate capacity limits that can be determined by traffic engineering. They usually experience a chaotic breakdown in flow and a dramatic drop in speed (colloquially known as a traffic jam) if they exceed about 2,000 vehicles per hour per lane (each car roughly two seconds behind another).[20] Since most people who drive to work or on business trips do so alone, studies show that the average car occupancy on many roads carrying commuters is only about 1.5 people per car during the high-demand rush hour periods of the day.[21]
This combination of factors limits roads carrying only automobile commuters to a maximum observed capacity of about 3,000 passengers per hour per lane. The problem can be mitigated by introducing high-occupancy vehicle (HOV) lanes and ride-sharing programs, but in most cases the solution adopted has been to add more lanes to the roads.
By contrast, light rail vehicles can travel in multi-car trains carrying a theoretical ridership up to 20,000 passengers per hour in much narrower rights-of-way, not much more than two car lanes wide for a double track system.[22] They can often be run through existing city streets and parks, or placed in the medians of roads. If run in streets, trains are usually limited by city block lengths to about four 180-passenger vehicles (720 passengers). Operating on two-minute headways using traffic signal progression, a well-designed two-track system can handle up to 30 trains per hour per track, achieving peak rates of over 20,000 passengers per hour in each direction. More advanced systems with separate rights-of-way using moving block signalling can exceed 25,000 passengers per hour per track.[23]
Practical considerations
Most light rail systems in the United States are limited by demand rather than capacity (by and large, most American LRT systems carry fewer than 4,000 persons per hour per direction), but Boston's and San Francisco's light rail lines carry 9,600 and 13,100 passengers per hour per track during rush hour.[24] Elsewhere in North America, the Calgary C-Train and Monterrey Metro have higher light rail ridership than Boston or San Francisco. Systems outside North America often have much higher passenger volumes. The Manila Light Rail Transit System is one of the highest capacity ones, having been upgraded in a series of expansions to handle 40,000 passengers per hour per direction, and having carried as many as 582,989 passengers in a single day on its Line 1.[25] It achieves this volume by running four-car trains with a capacity of up to 1,350 passengers each at a frequency of up to 30 trains per hour. However, the Manila light rail system has full grade separation and as a result has many of the operating characteristics of a metro system rather than a light rail system. A capacity of 1,350 passengers per train is more similar to heavy rail than light rail.
A bus rapid transit (BRT) system using dedicated lanes can have a theoretical capacity of 3,600 passengers per hour per direction (30 buses per direction, 120 passengers in articulated buses). BRT is an alternative to LRT, at least if very high capacity is not needed. Using buses, roads can achieve a much higher commuter capacity than is achievable with passenger cars. To have 30 buses per direction an hour, buses must have priority at traffic lights and have their own dedicated lanes. Buses can travel closer to each other than rail vehicles because of better braking capability. However, each bus vehicle requires a single driver, whereas a light rail train may have three to four cars of much larger capacity in one train under the control of one driver, or no driver at all in fully automated systems, increasing the labor costs of high-traffic BRT systems compared to LRT systems.
The peak passenger capacity per lane per hour depends on which types of vehicles are allowed at the roads. Typically roadways have 1,900 passenger cars per lane per hour (pcplph).[26] If only cars are allowed, the capacity will be less and will not increase when the traffic volume increases.
When there is a bus driving on this route, the capacity of the lane will be more and will increase when the traffic level increases. And because the capacity of a light rail system is higher than that of a bus, there will be even more capacity when there is a combination of cars and light rail. Table 3 shows an example of peak passenger capacity.
| Car | Car + bus | Car + light rail | |
|---|---|---|---|
| Low volume | 900 | 1,650 | 2,250 |
| Medium volume | 900 | 2,350 | 3,250 |
| High volume | 900 | 3,400 | 4,600 |
(Edson & Tennyson, 2003)
Safety
An analysis of data from the 505-page National Transportation Statistics report [27] published by the US Department of Transportation shows that light rail fatalities are higher than all other forms of transportation except motorcycle travel (31.5 fatalities per 100 million miles).[28]
However, the National Transportation Statistics report [27] published by the US Department of Transportation states that "Caution must be exercised in comparing fatalities across modes because significantly different definitions are used. In particular, Rail and Transit fatalities include incident-related (as distinct from accident-related) fatalities, such as fatalities from falls in transit stations or railroad employee fatalities from a fire in a workshed. Equivalent fatalities for the Air and Highway modes (fatalities at airports not caused by moving aircraft or fatalities from accidents in automobile repair shops) are not counted toward the totals for these modes. Thus, fatalities not necessarily directly related to in service transportation are counted for the transit and rail modes, potentially overstating the risk for these modes."
Construction and operation costs
The cost of light rail construction varies widely, largely depending on the amount of tunneling and elevated structures required. A survey of North American light rail projects[29] shows that costs of most LRT systems range from $15 million to over $100 million per mile. Seattle's new light rail system is by far the most expensive in the US, at $179 million per mile, since it includes extensive tunneling in poor soil conditions, elevated sections, and stations as deep as 180 feet (55 m) below ground level.[30] This results in costs more typical of subways or rapid transit systems than light rail. At the other end of the scale, four systems (Baltimore, Maryland; Camden, New Jersey; Sacramento, California; and Salt Lake City, Utah) incurred construction costs of less than $20 million per mile. Over the US as a whole, excluding Seattle, new light rail construction costs average about $35 million per mile.[29]
By comparison, a freeway lane expansion typically costs $1.0 million to $8.5 million per lane mile for two directions, with an average of $2.3 million.[31] However, freeways are frequently built in suburbs or rural areas, whereas light rail tends to be concentrated in urban areas, where right of way and property acquisition is expensive. Similarly, the most expensive US highway expansion project was the "Big Dig" in Boston, Massachusetts, which cost $200 million per lane mile for a total cost of $14.6 billion. A light rail track can carry up to 20,000 people per hour as compared with 2,000–2,200 vehicles per hour for one freeway lane,[32]. For example, in Boston and San Francisco, light rail lines carry 9,600 and 13,100 passengers per hour, respectively, in the peak direction during rush hour.[24]
Combining highway expansion with LRT construction can save costs by doing both highway improvements and rail construction at the same time. As an example, Denver's Transportation Expansion Project rebuilt interstate highways 25 and 225 and added a light rail expansion for a total cost of $1.67 billion over five years.[33] The cost of 17 miles (27 km) of highway improvements and 19 miles (31 km) of double-track light rail worked out to $19.3 million per highway lane-mile and $27.6 million per LRT track-mile. The project came in under budget and 22 months ahead of schedule.[34]
LRT cost efficiency improves dramatically as ridership increases, as can be seen from the numbers above: the same rail line, with similar capital and operating costs, is far more efficient if it is carrying 20,000 people per hour than if it is carrying 2,400. The Calgary, Alberta, C-Train used many common light rail techniques to keep costs low, including minimizing underground and elevated trackage, sharing transit malls with buses, leasing rights-of-way from freight railroads, and combining LRT construction with freeway expansion. As a result, Calgary ranks toward the less expensive end of the scale with capital costs of around $24 million per mile.[35]
However, Calgary's LRT ridership is much higher than any comparable US light rail system, at 300,000 passengers per weekday, and as a result its capital efficiency is also much higher. Its capital costs were one-third those of the San Diego Trolley, a comparably sized US system built at the same time, while by 2009 its ridership was approximately three times as high. Thus, Calgary's capital cost per passenger was much lower than that of San Diego. Its operating cost per passenger was also much lower because of its higher ridership. A typical C-Train vehicle costs only CA$163 (equivalent to $192 in 2016) per hour to operate, and since it averages 600 passengers per operating hour,[36] Calgary Transit estimates that its LRT operating costs are only 27 cents per ride, versus $1.50 per ride on its buses.[35]
Compared to buses, costs can be lower due to lower labor costs per passenger mile, higher ridership (observations show that light rail attracts more ridership than a comparable bus service)[citation needed] and faster average speed (reducing the number of vehicles needed for the same service frequency). While light rail vehicles are more expensive to buy, they have a longer useful life than buses, sometimes making for lower life-cycle costs.
Health impact
Integration with bicycles
Light rail lines have various policies on bicycles.[37] Some fleets restrict bicycles on trains during peak hours. Some light rail systems, such as the St. Louis MetroLink, allow bicycles on the trains, but only in the rear sections of cars. Some light rail lines, like San Francisco's, allow only folding bicycles on board.[38] In some systems dedicated bike parking is available at select stations and others are integrated with local bike share systems.
Variations
Trams operating on mainline railways
On the Karlsruhe Stadtbahn, trams sometimes share mainline tracks with heavy rail trains
Around Karlsruhe, Kassel, and Saarbrücken in Germany, dual-voltage light rail trains partly use mainline railroad tracks, sharing these tracks with heavy rail trains. In the Netherlands, this concept was first applied on the RijnGouweLijn. This allows commuters to ride directly into the city centre, rather than taking a mainline train only as far as a central station and then having change to a tram. In France, similar tram-trains are planned for Paris, Mulhouse, and Strasbourg; further projects exist. In some cases, tram-trains use previously abandoned or lightly used heavy rail lines in addition to or instead of still in use mainline tracks.
Some of the issues involved in such schemes are:
- compatibility of the safety systems
- power supply of the track in relation to the power used by the vehicles (frequently different voltages, rarely third rail vs overhead wires)
- width of the vehicles in relation to the position of the platforms
- height of the platforms
There is a history of what would now be considered light rail vehicles operating on heavy rail rapid transit tracks in the US, especially in the case of interurban streetcars. Notable examples are Lehigh Valley Transit trains running on the Philadelphia and Western Railroad high-speed third rail line (now the Norristown High Speed Line). Such arrangements are almost impossible now, due to the Federal Railroad Administration refusing (for crash safety reasons) to allow non-FRA compliant railcars (i.e., subway and light rail vehicles) to run on the same tracks at the same times as compliant railcars, which includes locomotives and standard railroad passenger and freight equipment. Notable exceptions in the US are the NJ Transit River Line from Camden to Trenton and Austin's Capital MetroRail, which have received exemptions to the provision that light rail operations occur only during daytime hours and Conrail freight service only at night, with several hours separating one operation from the other. The O-Train Trillium Line in Ottawa also has freight service at certain hours.
Third-rail power for trams
When electric streetcars were introduced in the late 19th century, conduit current collection was one of the first ways of supplying power, but it proved to be much more expensive, complicated, and trouble-prone than overhead wires. When electric street railways became ubiquitous, conduit power was used in those cities that did not permit overhead wires. In Europe, it was used in London, Paris, Berlin, Marseille, Budapest, and Prague. In the United States, it was used in parts of New York City and Washington, D.C.[39]Third rail technology was investigated for use on the Gold Coast of Australia for the G:link light rail,[40] though power from overhead lines was ultimately utilized for that system.
In the French city of Bordeaux, the tramway network is powered by a third rail in the city centre, where the tracks are not always segregated from pedestrians and cars.[41] The third rail (actually two closely spaced rails) is placed in the middle of the track and divided into eight-metre sections, each of which is powered only while it is completely covered by a tram. This minimises the risk of a person or animal coming into contact with a live rail. In outer areas, the trams switch to conventional overhead wires. The Bordeaux power system costs about three times as much as a conventional overhead wire system, and took 24 months to achieve acceptable levels of reliability, requiring replacement of all the main cables and power supplies.[42] Operating and maintenance costs of the innovative power system still remain high. However, despite numerous service outages, the system was a success with the public, gaining up to 190,000 passengers per day.
Comparison to other rail transit modes
With its mix of right-of-way types and train control technologies, LRT offers the widest range of latitude of any rail system in the design, engineering, and operating practices. The challenge in designing light rail systems is to realize the potential of LRT to provide fast, comfortable service while avoiding the tendency to overdesign that results in excessive capital costs beyond what is necessary to meet the public's needs.[43]
| Alternative | Differences |
|---|---|
Rapid transit | Light rail vehicles (LRVs) are distinguished from rapid rail transit (RRT) vehicles by their capability for operation in mixed traffic, generally resulting in a narrower car body and articulation in order to operate in a street traffic environment. With their large size, large turning radius, and often an electrified third rail, RRT vehicles cannot operate in the street. Since LRT systems can operate in existing streets, they can often avoid the cost of expensive grade-separated subway and elevated segments that would be required with RRT. |
Streetcars or trams | Conversely, LRVs generally outperform traditional streetcars in terms of capacity and top-end speed, and almost all modern LRVs are capable of multiple-unit operation. The latest generation of LRVs is considerably larger and faster, typically 29 metres (95 ft) long with a maximum speed of around 105 kilometres per hour (65 mph).[44] |
Heritage streetcars | A variation considered by many cities is to use historic or replica cars on their streetcar systems instead of modern LRVs. A heritage streetcar may not have the capacity and speed of an LRV, but it will add to the ambiance and historic character of its location. |
Light metro | A derivative of LRT is light rail rapid transit (LRRT), also referred to as light metro. Such railways are characterized by exclusive rights of way, advanced train control systems, short headway capability, and floor-level boarding. These systems approach the passenger capacity of full metro systems, but can be cheaper to construct due to LRVs generally being smaller in size, turning tighter curves and climbing steeper grades than standard RRT vehicles, and having a smaller station size. |
Interurbans | The term interurban mainly refers to rail cars that run through streets like ordinary streetcars (trams), but also between cities or towns, often through rural environments. In the period 1900–1930, interurbans were very common in the US, especially in the Midwest. Some of them, like the Red Devils, the J. G. Brill Bullets, and the Electroliners, were the high-speed railcars of their time, with an in-service speed of up to about 145 km/h (90 mph). In Europe interurbans are making a comeback as "tram-trains" (locally known under different names) that operate on both railway and light rail tracks, often with different voltage. The Karlsruhe Stadtbahn is one well known example. |
Typical rolling stock
The BART railcar in the following chart is not generally considered to be a "light rail" vehicle (it is actually a heavy rail vehicle), and is only included for comparison purposes.
| Type | Rapid transit (heavy rail) | Light rail | Tram, or streetcar | Heritage streetcar |
|---|---|---|---|---|
| Manufacturer | Rohr | Siemens | Skoda | Gomaco Trolley Co. |
| Model | BART A-Car | S70 | 10T | Replica Birney |
| Width | 3.2 metres (10 ft) | 2.7 metres (8.9 ft) | 2.6 metres (8.53 ft) | 2.62 metres (8.6 ft) |
| Length | 22.9 metres (75 ft) | 27.7 metres (91 ft) articulated | 20.13 metres (66.0 ft) articulated | 15.16 metres (49.7 ft) |
| Weight (empty) | TBD | 48.6 t[45] | 28.8 t | 23.5 t[46] |
| Capacity | 150 max. | 72 seats, 220 max.[45] | 30 seats, 157 max. | 40 seats, 50 max.[46] |
| Top speed | 125 km/h (78 mph) | 106 km/h (66 mph) | 70 km/h (43 mph) | 48 km/h (30 mph) |
| Typical consist | 4–10 vehicles | 2–5 vehicles | 1 vehicle | 1 vehicle |
Train operation
An important factor crucial to LRT is the train operator. Unlike rail rapid transit, which can travel unattended under automatic train operation (ATO), safe, high-quality LRT operation relies on a human operator as a key element. The reason that the operator is so important is because the train tracks often share the streets with automobiles, other vehicles, and pedestrians. If trains were fully automated on roads, nobody would be there to stop the train if a car pulled in front of it. Light rail trains are actually very sturdily built for passenger safety, and to reduce damage from impacts with cars.[citation needed]
Floor height
The latest generation of LRVs has the advantage of partially or fully low-floor design, with the floor of the vehicles only 300 to 360 mm (11.8 to 14.2 in) above the top of the rail, a feature not found in either rapid rail transit vehicles or streetcars. This allows them to load passengers, including those in wheelchairs or strollers, directly from low-rise platforms that are little more than raised sidewalks. This satisfies requirements to provide access to disabled passengers without using expensive and delay-inducing wheelchair lifts, while also making boarding faster and easier for other passengers.[citation needed]
Power sources
Overhead lines supply electricity to the vast majority of light rail systems. This avoids the danger of passengers stepping on an electrified third rail. The Docklands Light Railway uses an inverted third rail for its electrical power, which allows the electrified rail to be covered and the power drawn from the underside. Trams in Bordeaux, France, use a special third-rail configuration where the power is only switched on beneath the trams, making it safe on city streets. Several systems in Europe and a few recently opened systems in North America use diesel-powered trains.[citation needed]
Tram and other light rail transit systems worldwide
The Tren de la Costa in Greater Buenos Aires
Metrotram in Kryvyi Rih (Ukraine) was separated from the streets, but later it was upgraded to be compatible with common tramways
Around the world there are many tram and streetcar systems. Some date from the beginning of the 20th century or earlier, but many of the original tram and streetcar systems were closed down in the mid-20th century, with the exceptions of many Eastern Europe countries. Even though many systems closed down over the years, there are still a number of tram systems that have been operating much as they did when they were first built over a century ago. Some cities (such as Los Angeles and Jersey City) that once closed down their streetcar networks are now restoring, or have already rebuilt, at least some of their former streetcar/tram systems. Most light rail services are currently committed to articulated vehicles like modern LRVs, i.e. trams, with the exception of large underground metro or rapid transit systems.
A number of UK cities have substantial light rail networks including Nottingham, Manchester and a line between Birmingham and Wolverhampton, with plans to extend out as far as Coventry.
See also
- Cater MetroTrolley
- Capa vehicle
- General Motors streetcar conspiracy
- H-Bahn
- Light rail in North America
- Light Rail Transit Association
- List of North American light rail systems by ridership
- List of rail transit systems in the United States
List of town tramway systems (all-time lists)
List of tram and light rail transit systems
(operational systems only)- List of United States light rail systems by ridership
- Medium-capacity rail transport system
- Passenger rail terminology
- Railway electrification system
- Rubber-tyred trams
- Streetcars in North America
- Tram
- Tram and light rail transit systems
- Urban rail transit
References
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^ "This Is Light Rail Transit" (PDF). Transportation Research Board. pp. 7–9. Retrieved 2015-01-06.
^ "What is Light Rail?". Light Rail Transit Association (LRTA). Retrieved 2015-01-06.
^ "Welcome to Saskrailmuseum.org". Saskatchewan Railway Museum. BlackNova Internet Services. 11 September 2008. Archived from the original on 15 October 2008. Retrieved 2009-12-26.
^ Courtenay, Peter (2006). "Trams in the UK". thetrams.co.uk. Retrieved 26 December 2009.
^ ab Bottoms, Glen (2000). Continuing Developments in Light Rail Transit in Western Europe (PDF). 9th National Light Rail Transit Conference. Portland, Oregon: Light Rail Transit Association. Retrieved 26 December 2009.
^ Thompson, Gregory L. (2003). "Defining an Alternative Future: The Birth of the Light Rail Movement in North America". Transportation Research Circular. Transportation Research Board (E-C058). Retrieved 26 December 2009. From: 9th National Light Rail Transit Conference
^ Gregory L. Thompson (2003), Defining an Alternative Future: Birth of the Light Rail Movement in North America (PDF), Transportation Research Board.
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^ ab Hanson, Susan; Giuliano, Genevieve (2004). The geography of urban transportation. Guilford Press. ISBN 1-59385-055-7.
^ "LRT-1 sets 25-year high record ridership". Manilla Light Rail Transit Authority. 12 January 2009. Archived from the original on 26 March 2009. Retrieved 2009-03-14.
^ "NCHRP Report 599: Default Values for Highway Capacity and Level of Service Analyses" (PDF). NATIONAL COOPERATIVE HIGHWAY RESEARCH PROGRAM.
^ ab "National Transportation Statistics 2013" (PDF). U.S. Department of Transportation.
^ "Dissected: How're Ya Dying? Charting transportation mayhem in its many gory varieties".
^ ab
"Status of North American Light Rail Projects". Light Rail Now. 2002. Archived from the original on 28 October 2006. Retrieved 23 November 2006.
^
"Link Light Rail Projects". Sound Transit (Central Puget Sound Regional Transit Authority). 2006. Archived from the original on 2006-11-17. Retrieved 2006-11-23.
^ "Highway Construction Cost Comparison Survey Final Report" (PDF). Washington State Department of Transportation. April 2002. p. 3. Archived from the original (PDF) on 2009-09-05.
^ Traffic and Highway Engineering By Nicholas J. Garber, Lester A. Hoel, p. 37
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Flynn, Kevin (17 November 2006). "T-REX trains ready to roll". Rocky Mountain News (Denver, CO). Retrieved 2006-11-20.
^ ab
McKendrick; et al. (2006). "Calgary's C-Train – Effective Capital Utilization" (PDF). Joint International Light Rail Conference, St. Louis, Missouri. Calgary Transit. Archived from the original (PDF) on 18 December 2011. Retrieved 11 February 2008.
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"LRT technical data". Calgary Transit. 2006. Archived from the original on 2006-10-23. Retrieved 2006-10-14.
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Fazio, A. E.; Hickey, T. R. (2003). "Designing New Light Rail – Taking Engineering Beyond Vanilla". Circular E-C058: 9th National Light Rail Transit Conference. Transportation Research Board. Retrieved 2006-11-10.
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^ ab "Siemens S70 Low-floor Light Rail Vehicle" (PDF). Siemens.
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External links
 | Wikimedia Commons has media related to Light rail. |
Light Rail Transit Committee of the Transportation Research Board (US)
Light Rail Transit Association (UK-based, international organization)
Light Rail Now! (US) A pro-light rail web site, opposing monorails, Bus Rapid Transit (busways), and other less common transportation systems
Light Rail Netherlands (NL) in English, Nederlands, Русский, Deutsch, Français, Español
"This Is Light Rail Transit" (PDF) brochure by the American Public Transportation Association (APTA) (2000; updated 2003)- Photo gallery of the world's light rail
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