 | This article needs additional citations for verification .(July 2010) |
Urban rail transit is a wide term for various types of local rail systems providing passenger service within and around urban or suburban areas. The set of urban rail systems can be roughly subdivided into the following categories, which sometimes overlap because some systems or lines have aspects of multiple types.
A tram, streetcar, or trolley system is a rail-based transit system that runs mainly or completely along streets (with street running), with a relatively-low capacity and frequent stops; however, modern trams have a greater passenger capacity than traditional trams. Passengers usually board at the street or curb level, but low-floor trams may allow level boarding. Longer-distance lines are called interurbans or radial railways. Modern trams also operate as self-propelled trains coupled through a multiple unit instead of individual trams and are often included within the broader term light rail; [1] however, they differ in that trams frequently share the platform with vehicular traffic and do not have signal priority. [2] [3]
The term "tram" is used in most parts of the world. In North America, such systems are referred to as "streetcar" or "trolley" systems. In Germany, such systems are called Straßenbahn, which literally translates as "street train" or "street railway".
A light rail system is a rail-based transit system that has higher capacity and speed than a tram, usually by operating in an exclusive right-of-way separated from automobile traffic, but it is not, unlike rapid transit, fully grade-separated from other traffic. Light rail also generally operates with multiple-unit trains, rather than single tramcars. It emerged as an evolution of trams/streetcars. Light rail systems vary significantly in terms of speed and capacity and range from slightly improved tram systems to systems that are essentially rapid transit but with some level crossings.
The term "light rail" is the most common term especially in Americas, but German systems are called Stadtbahn , which translates to "city railway".
A rapid transit system is a railway, usually in an urban area, with high passenger capacities and frequency of service and (usually) full grade separation from other traffic, including other rail traffic.
In most parts of the world, such systems are known as a "metro", short for "metropolitan", which is itself short for "Metropolitan Railway", the first such system in the world. The term "subway" is used in many American systems, as well as in Glasgow and in Toronto. The system in London is named the "Underground" and is commonly nicknamed the "tube". Systems in Germany are called "U-Bahn", which stands for Untergrundbahn ("underground rail"). Many systems in East, Southeast and South Asia like Taipei, Chennai and Singapore, are called "MRT", which stands for "mass rapid transit". Systems that are predominantly elevated may be referred to as "L", as in Chicago, or "Skytrain", as in Bangkok and Vancouver. Other less common names include "T-bane", which stands for "tunnelbana" (in Scandinavia, literally tunnel track) and "MTR" (mass transit railway).
A monorail is a railway in which the track consists of a single rail, as opposed to the traditional track with two parallel rails.
The term possibly comes from 1897, [4] from German engineer Eugen Langen, who called an elevated railway system with wagons suspended the Eugen Langen One-railed Suspension Tramway (Einschieniges Hängebahnsystem Eugen Langen). [5]
A commuter rail, regional rail or suburban rail system operates on mainline trackage, which may be shared with intercity rail and freight trains. Systems tend to operate at lower frequencies than rapid transit or light rail systems but tend to travel at higher speeds, have more widely spaced stations and cover longer overall distances. They have high passenger capacities per single train.
Though many European and East Asian commuter rail systems operate with frequencies and rolling stock similar to that of rapid transit, they do not qualify as such because they share tracks with intercity/freight trains, or they have at grade crossings. For example, S-trains are hybrid systems combining the characteristics of both rapid transit and commuter rail systems. Generally, S-trains share tracks with mainline passenger and freight trains, but the distances between stations and the service headway resemble metro systems.
Automated guideway transit systems tend to operate with medium passenger capacities.
Larger systems span a variety of conceptual designs, from subway-like advanced rapid transit (ART) systems to smaller (typically two to six passengers) vehicles known as personal rapid transit (PRT) which offer direct point-to-point travel along a switched network. [6]
A funicular is a cable-driven inclined railway that uses the weight of descending cars to help pull the ascending cars up the slope.
The term funicular derives from the Latin word funiculus , the diminutive of funis , meaning 'rope'. [7]
A cable car, in the context of mass transit, is a system using rail cars that are hauled by a continuously moving cable that runs at a constant speed. Individual cars stop and start by releasing and gripping the cable as required. Cable cars are distinct from funiculars (whose cars are permanently attached to the cable) and cable railways (which are similar to funiculars but have rail vehicles that are attached and detached manually).
Transit agencies' names for lines do not necessarily reflect their technical categorization. For example, the Green Line in Boston is referred to as a subway although it is mostly made up of above-ground portions. Conversely, the Docklands Light Railway in London, C Line in Los Angeles, and some metro lines in China are referred to as "Light Rail" but qualify as rapid transit because they are fully grade-separated and provide a high frequency of service.
Many cities use names such as subway and elevated railway to describe their entire systems, even if they combine both methods of operation. Slightly less than half of the London Underground's tracks, for example, are actually underground. The New York City Subway also combines elevated and subterranean stations, and the Chicago "L" and the Vancouver SkyTrain use tunnels to run through central areas.
A bus shares many characteristics with light rail and trams but does not run on rails. Trolleybuses are buses that are powered from overhead wires. Vehicles that can travel both on rails and on roads have been tried experimentally but are not in common use. The term bus rapid transit is used to refer to various methods of providing faster bus services and the systems that use it have similar characteristics to light rail. Guided buses are buses capable of being steered by external means, usually on a dedicated track or roll way that excludes other traffic. Some cities experimenting with guided bus technologies, such as Nancy, have chosen to refer to them as 'trams on tires' (rubber-tired trams) and given them tram-like appearances.
 | The examples and perspective in this article may not represent a worldwide view of the subject.(December 2010) |
In a 2006 article, the political scientist Ted Balaker and the urban planner Cecilia Juong Kim stated that public rail transit provides certain benefits for a community but also that the goals of policymakers are not often met. They also note some American economists claim that contrary to popular belief, rail transit has failed to improve the environment, serve the poor, or reduce highway congestion in the United States. They also claim economists are somewhat more optimistic about rail transit's impact on economic development. [8]
A monorail is a railway in which the track consists of a single rail or beam. Colloquially, the term "monorail" is often used to describe any form of elevated rail or people mover. More accurately, the term refers to the style of track. Monorail systems are most frequently implemented in large cities, airports, and theme parks.
A train is a series of connected vehicles that run along a railway track and transport people or freight. Trains are typically pulled or pushed by locomotives, though some are self-propelled, such as multiple units or railcars. Passengers and cargo are carried in railroad cars, also known as wagons or carriages. Trains are designed to a certain gauge, or distance between rails. Most trains operate on steel tracks with steel wheels, the low friction of which makes them more efficient than other forms of transport.
A tram is a type of urban rail transit consisting of rail vehicles, either individual railcars or self-propelled trains coupled into multiple units that run on tramway tracks on urban public streets; some include segments on segregated right-of-way. The tramlines or tram networks operated as public transport are called tramways or simply trams/streetcars. Trams are now commonly included in the wider term light rail, which also includes grade-separated segments of systems.
A people mover or automated people mover (APM) is a type of small scale automated guideway transit system. The term is generally used only to describe systems serving relatively small areas such as airports, downtown districts or theme parks.
Light rail transit (LRT) is a form of passenger urban rail transit using rolling stock derived from tram technology while also having some features from heavy rapid transit.
Intermodal passenger transport, also called mixed-mode commuting, involves using two or more modes of transportation in a journey. Mixed-mode commuting is often used to combine the strengths of various transportation options. A major goal of modern intermodal passenger transport is to reduce dependence on the automobile as the major mode of ground transportation and increase use of public transport. To assist the traveller, various intermodal journey planners such as Rome2rio and Google Transit have been devised to help travellers plan and schedule their journey.
Various terms are used for passenger railway lines and equipment; the usage of these terms differs substantially between areas:
Public transport in Istanbul comprises a bus network, various rail systems, funiculars, and maritime services to serve the more than 15 million inhabitants of the city spread over an area of 5,712 km2.
Rail transport – means of conveyance of passengers and goods by way of wheeled vehicles running on rail tracks consisting of steel rails installed on sleepers/ties and ballast.
The transport network in Greater Tokyo includes public and private rail and highway networks; airports for international, domestic, and general aviation; buses; motorcycle delivery services, walking, bicycling, and commercial shipping. While the nexus is in the central part of Tokyo, every part of the Greater Tokyo Area has rail or road transport services. There are also a number of ports offering sea and air transport to the general public.
The following outline is provided as an overview of and topical guide to transport:
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.
A medium-capacity system (MCS), also known as light rapid transit or light metro, is a rail transport system with a capacity greater than light rail, but less than typical heavy-rail rapid transit. MCS's trains are usually 1 to 4 cars. Most medium-capacity rail systems are automated or use light-rail type vehicles.
Rapid transit or mass rapid transit (MRT), commonly referred to as metro, is a type of high-capacity public transport that is generally built in urban areas. A grade separated rapid transit line below ground surface through a tunnel can be regionally called a subway, tube, or underground. They are sometimes grade-separated on elevated railways, in which case some are referred to as el trains - short for "elevated". Rapid transit systems are railways, usually electric, that unlike buses or trams operate on an exclusive right-of-way, which cannot be accessed by pedestrians or other vehicles.
These lists of urban rail transit systems are sorted by the type of system:
Urban rail transit in India plays an important role in intracity transportation in the major cities which are highly populated. It consists of rapid transit, suburban rail, monorail, and tram systems.
Public transport is a system of transport for passengers by group travel systems available for use by the general public unlike private transport, typically managed on a schedule, operated on established routes, and that may charge a posted fee for each trip. There is no rigid definition of which kinds of transport are included, and air travel is often not thought of when discussing public transport—dictionaries use wording like "buses, trains, etc." Examples of public transport include city buses, trolleybuses, trams and passenger trains, rapid transit and ferries. Public transport between cities is dominated by airlines, coaches, and intercity rail. High-speed rail networks are being developed in many parts of the world.
The following outline is provided as an overview of and topical guide to public transport:
Urban rail transit in Africa has emerged as a growing form of transit due to rapid urbanization that has occurred in recent decades across the continent. Some of these transit systems are older and more developed, such as the metro in Cairo which opened in 1987. Others such as the light-rail system in Addis Ababa are much more recent, which opened in 2015. A variety of technologies are being used ranging from light-rail, bus rapid-transit, and commuter-rail etc. Africa for several decades saw minimal investment in rail infrastructure, but in recent years due to urban population growth and improved financing options, investment in rail networks has increased.
