- Metro Taipei
- BTR-60
- Medium-capacity rail system
- List of tram and light rail transit systems
- Lists of urban rail transit systems
- Light rail
- List of metro systems
- Rapid transit
- LRT (disambiguation)
- Urban rail transit
- Public transport
- Rail transport in Malaysia
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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 trains are usually 1 to 4 cars. Most medium-capacity rail systems are automated or use light-rail type vehicles.
Since ridership determines the scale of a rapid transit system, statistical modeling allows planners to size the rail system for the needs of the area. When the predicted ridership falls between the service requirements of a light rail and heavy-rail rapid transit or metro system, an MCS project is indicated. An MCS may also result when a rapid transit service fails to achieve the requisite ridership due to network inadequacies (e.g. single-tracking) or changing demographics.
In contrast with light rail systems, an MCS runs on a fully grade separated exclusive right-of-way. In some cases, the distance between stations is much longer than typically found on heavy rail networks. An MCS may also be suitable for branch line connections to another mode of a heavy-capacity transport system, such as an airport or a main route of a metro network.
Definition
The medium capacity designation is created from relative lower capacity and/or train configuration comparisons to other heavy rail systems. For example, the train in an MCS may have a shorter configuration than the standard metro system, with fewer traincars than a heavy capacity systems, allowing for shorter platforms to be built and used. Rather than using steel wheels, rubber-tyred metro technology, such as the VAL system used on the Taipei Metro, is sometimes recommended, due to its low running noise, as well as the ability to climb steeper grades and turn tighter curves, thus allowing more flexible alignments.
Fully heavy rail or metro systems generally have train headways of 10 minutes or better during peak hours. Some systems that qualify as heavy rail/metro in every other way (e.g. are fully grade separated), but which have network inadequacies (e.g. a section of single track rail) can only achieve lesser headways (e.g. every 15 minutes) which result in lower passenger volume capacities, and thus would be more accurately defined as "light metro" or "medium-capacity" systems as a result.
= Capacity
=A report from the World Bank places the capacity of an MCS at 15,000 to 30,000 p/h/d. For comparison, ridership capacity of more than 30,000 p/h/d has been quoted as the standard for metro or "heavy rail" standards rapid transit systems, while light rail systems have passenger capacity volumes of around 10,000 to 12,000 p/h/d or 12,000 to 18,000 p/h/d. VAL (Véhicule Automatique Léger) systems are categorised in the medium-capacity rail systems because their manufacturer defines their passenger capacities as being up to 30,000 p/h/d.
However, the capacity boundaries for a line to be categorised as a medium-capacity system can vary due to its non-standardisation. Inconsistencies in international definitions are even reflected within individual countries. For example, the Taiwan Ministry of Transportation and Communications states that each MCS system can board around 6,000 to 20,000 passengers per hour per direction (p/h/d or PPHPD), while the Taiwan Department of Rapid Transit Systems (TCG) suggests an MCS has a capability of boarding around 20,000 to 30,000 p/h/d,
In Hong Kong, MTR's Ma On Shan line was locally classified as a medium-capacity system (as it used shorter 4-car SP1950 trains, compared to 7- to 12-car trains on other MTR lines) but can attain up to 32,000 p/h/d which is comparable to the passenger capacity of some full metro transit networks. However, it was built to the full heavy rail standard as it was designed to be extended. Full-length, 8-car trains were deployed on the line in advance of its extension into the Tuen Ma line in June 2021. Two other lines, the Disneyland Resort line shuttle service since 2005 and the South Island line since December 2016, are also classified as MCS because of their shorter trains and smaller capacity, however they use the same technology as the full-capacity rapid transit lines.
Terminology
In addition to MCS, light metro is a common alternative word in European countries, India, and South Korea.
In some countries, however, light metro systems are conflated with light rail. In South Korea, light rail is used as the translation for the original Korean term, "경전철" – its literal translation is "light metro", but it actually means "Any railway transit other than heavy rail, which has capacity between heavy rail and bus transit". For example, the U Line in Uijeongbu utilises the VAL system, a variant of medium-capacity rail transport, and is therefore categorised "light metro" by LRTA and others, though the operator itself and South Korean sources refer to the U Line as "light rail". Busan–Gimhae Light Rail Transit is also akin to a light metro in its appearance and features, thought the operator refers it as a "light rail". Likewise, Malaysian officials and media commonly refer to the Kelana Jaya, Ampang and Sri Petaling lines as "light rail transit" systems; when originally opened, the original Malay abbreviations for the lines, PUTRA-LRT (Projek Usahasama Transit Ringan Automatik/Automatic Light Transit Joint Venture Project) and STAR-LRT (Sistem Transit Aliran Ringan/Light Flow Transit System) did not clearly distinguish between light rail and light rapid transit. Some articles in India also refer to some "light metro"-type systems as "light rail". The Light Rail Transit Association (LRTA), a nonprofit organisation, also categorises several public transport systems as "light metro".
Advantages and disadvantages
The main reason to build a light metro instead of a regular metro is to reduce costs, mainly because this system employs shorter vehicles and shorter stations.
Light metros may operate faster than heavy-rail rapid transit systems due to shorter dwell times at stations, and the faster acceleration and deceleration of lighter trains. For example, express trains on the New York City Subway are about as fast as the Vancouver SkyTrain, but these express trains skip most stops on lines where they operate.
Medium-capacity systems have restricted growth capacities as ridership increases. For example, it is difficult to extend station platforms once a system is in operation, especially for underground railway systems, since this work must be done without interfering with traffic. Some railway systems, like Hong Kong and Wuhan, may make advance provisions for longer platforms, for example, so that they will be able to accommodate trains with more, or longer cars, in the future. Taipei Metro, for example, constructed extra space for two extra cars in all its Wenhu Line stations.
List of medium-capacity rail systems
The following is the list of currently-operating MCSs which are categorised as light metros by the Light Rail Transit Association (LRTA) as of March 2018, unless otherwise indicated.
The list does not include, for example, monorails and urban maglev, despite most of them also being "medium-capacity rail system".
= Under construction
== Former MCSs
=The following is the list of former-MCSs that either developed into a full rapid transit system, or which are no longer in operation:
Guangzhou, China
Line 3 – began with 3-car configuration, changed to 6-car in 2010.
Komaki, Japan
Peachliner – abandoned on 30 September 2006.
Seoul, South Korea
Line 9 – trains lengthened from 4 cars to 6 cars in 2019.
Sha Tin and Ma On Shan, Hong Kong
Ma On Shan Rail – converted from 4- to 8-car configuration and became part of Tuen Ma line.
Toronto, Ontario
Line 3 Scarborough – Categorised by APTA as being "intermediate rail" (i.e. between "heavy rail" and "light rail"), and categorised as a "light metro" by LRTA. Scheduled to cease operations in November 2023, service was suspended following a derailment in July 2023 and was not resumed, instead being replaced by an express bus service.
See also
Notes
References
Bibliography
Taplin, Michael. "A world of trams and urban transit". lrta.org. Light Rail Transit Association. Archived from the original on 2019-04-06. Retrieved 2014-08-12.
"Metros: Keeping pace with 21st century cities". uitp.org. International Association of Public Transport (French: L'Union internationale des transports publics (UITP)).
Schwandl, Robert. "UrbanRail.Net". UrbanRail.Net.
External links
Urban rail transit definitions by the US Transportation Research Board and the American Public Transportation Association
Jane's Urban Transport Systems Archived 2014-11-29 at the Wayback Machine
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