Medium-capacity rail transport system
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In rail transport, a medium-capacity system (MCS) is a non-universal term coined to differentiate an intermediate system between light rail and heavy rail. As such, it can be regarded as a medium-capacity rapid transit system. The concept is similar to Light Metro, found in European countries (see section Variants of the Term). 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 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 most light rail systems, an MCS usually 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 transportation system, such as an airport or a main route of a metro network.
The definition of a medium-capacity system varies due to its non-standardization. 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 6,000–20,000 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 20,000–30,000 p/h/d. For comparison, >30,000 p/h/d ridership capacity has been quoted as the standard for metro or "heavy rail" standards rapid transit systems, while light rail systems have been quoted to have passenger capacity volumes of around 12,000-18,000 p/h/d. However, passenger capacity volume is just one possible criterion used to define a medium-capacity rail transit system.
Another criterion that can be used to define a medium-capacity rail system is vehicle type. For example, the train in an MCS may have a shorter configuration than the standard metro system, usually three to six cars, 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.
Variants of the term
Usage of the term may vary in different countries. In Russia, the "Light Metro" (Лёгкое метро) 12 - Butovskaya Line has been built to serve residents of outer Moscow. This line connects passengers with the main routes of Moscow Metro. The French rubber-tyred fully automated metro system, VAL, also uses the term "Light Metro" to define its capacity (up to 30,000 p/h/d), and thus can also be categorized in the medium-capacity rail systems family. In Hong Kong, MTR's Ma On Shan Line is classified as a MCS but can attain up to 32,000 p/h/d, which is comparable to the passenger capacity of some full metro transit networks.
Advantages and disadvantages
The main reason to build a light metro instead of a regular metro is to reduce cost, mainly because of 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 the station platforms once in operation, since this must be done without interfering with traffic, especially for underground railway systems. Some railway systems like Hong Kong and Wuhan may make advance provisions such as longer platforms, so that they will be able to accommodate future trains with more or longer cars. Taipei Metro, for example, constructed extra space for two extra cars in all Wenshan Line and Neihu Line stations. The Ma On Shan Line in Hong Kong has even applied the railway standard (with less car configuration) for a possible link with the other existing heavy rail route without reconstructing the current system.[clarification needed]
List of MCS/light metro systems
|Ottawa||Canada||O-Train||1||2001||Single-tracked for most of at-grade route, limiting headways to 15 minutes. Uses DMU trains, so system is not electrified like most "Light Metros".|
(part of Toronto subway and RT)
|1||1985||Categorized by APTA as being "intermediate rail" (i.e. between "heavy rail" and "light rail")|
|Shanghai||China||Shanghai Metro: Line 5 and Line 6||2||2003,
|Wuhan||China||Wuhan Metro: Line 1||1||2004||Trains: 4-car config.|
|Copenhagen||Denmark||Copenhagen Metro||1||2002||Driverless vehicle system. Trains: 3-car config., 39 metres length.|
|Rennes||France||Rennes Metro||1||2013||VAL people mover system - while trains have 80 second headways, they can only carry 158 people per train. Categorized as a "light metro" by the Light Rail Transit Association (LRTA).|
|Hong Kong||Hong Kong||Ma On Shan Line (MTR),
South Island Line
|Ma On Shan Line – Trains: 4-car config.
South Island Line – Under construction: Fully Automatic Operation.
|Brescia||Italy||Brescia Metro||1||2013||Light Metro. Trains: 3-car config, 39 metres length. Categorized as a "light metro" by the Light Rail Transit Association (LRTA).|
|Catania||Italy||Catania Metro||1||1999||Light Metro. Single-tracked at-grade section limits headways to 15 minutes.|
|Genoa||Italy||Genoa Metro||1||1990||Generally considered to be a "light metro" considering its low frequency, limited hours of operation and reduced transport capacity, it is actually categorized as "light rail" by the Light Rail Transit Association (LRTA).|
|Milan||Italy||Milan Metro: Line 5||1||2013||Portions still under construction. Driverless vehicle system.|
|Naples||Italy||Naples Metro||1||1993||Line 6 is categorized as Light Metro, with only 16 minute headways. Line 1 has a single-tracked tunnel section.|
|Rome||Italy||Rome Metro: Line C||1||2014||Under construction. Driverless vehicle system.|
|Turin||Italy||Turin Metro||1||2006||Categorized as a "light metro" by the Light Rail Transit Association (LRTA).|
|Kuala Lumpur||Malaysia||Kelana Jaya Line||1||1998||Light Metro. Trains: Mixed 2-car, 4-car config. fleet.|
|Manila||Philippines||Manila Light Rail Transit System Line 1,
Manila Metro Rail Transit System
|Manila Light Rail Transit System Line 1 – Trains: began with 2-car configuration, changed to 3-car in 2004, and added 4-car config. in 2007.
Manila Metro Rail Transit System (MRT-3) – Trains: 3-car config., with a max. capacity of 1,182 passengers, and running with 4–5 minute headways. However, line is designed for 23,000 p/h/d capacity.
|Moscow||Russia||Moscow Metro: Line 12 – Butovskaya Line||1||2003||Can carry 6,700 p/h/d. Trains: 3–4-car config.|
|Singapore||Singapore||Singapore MRT: Circle MRT Line and Downtown MRT Line||2||2009,
|Trains: 3-car config.|
|Busan||South Korea||Busan–Gimhae Light Rail Transit||1||2011||Busan–Gimhae Light Rail Transit – Trains: 2-car config.|
|Uijeongbu||South Korea||U Line||1||2012||Trains: 2-car config.|
|Barcelona||Spain||Barcelona Metro: Line 11||1||2003|
|Palma, Majorca||Spain||Palma Metro: Line M1||1||2007||Mostly underground line operates with just 15-minute headways and two-car trains (306 passengers max.); one reference even categorizes line as "light rail".|
|Seville||Spain||Seville Metro||1||2000||Categorized as a "light metro" by the Light Rail Transit Association (LRTA).|
|Taipei||Taiwan||Taipei Metro: Brown (Wenhu) Line:
Wenshan Line & Neihu Line
|2||1996||Wenshan Line – Trains: Rubber-tire system; 4-car config.
Neihu Line – Extension of the Wenshan line.
|Ankara||Turkey||Ankaray Light Metro (A1 Line)||1||1996||Light Metro. Trains: 3-car config, approx. 90 metres length. Current capacity: 27,000 p/h/d.|
M1 Line (Istanbul Hafif Metro)
|1||1989||Light Metro. "Hafif Metro" literally translates as "Light Metro". Trains: 4-car config.|
|Glasgow||United Kingdom||Glasgow Subway||1||1896||Gauge: 4 ft (1,219 mm). Trains: 3-car config.
Categorized as a "light metro" by the Light Rail Transit Association (LRTA).
|London||United Kingdom||Docklands Light Railway||7||1987||Driverless vehicle system.|
|Newcastle upon Tyne||United Kingdom||Tyne and Wear Metro||2||1980||Hybrid 'heavy rail'/'light rail' system.|
|Philadelphia||United States||Norristown High Speed Line
(part of the SEPTA rail system)
|1||1907||Has been categorized by APTA as being "Light rapid rail transit" (i.e. between "rapid transit (heavy rail)" and "light rail")|
|Maracaibo||Venezuela||Maracaibo Metro||1||2006||Trains: 3-car trainset config, ~58 metres length (originally designed for Prague Metro).|
|Valencia||Venezuela||Valencia Metro||1||2007||Trains: 2-car Siemens SD-460 config, ~55 metres length.|
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