View source for Scomi SUTRA

{{Use dmy dates|date=September 2016}}
{{Use Indian English|date=January 2016}}
{{Infobox train
| name = Scomi Urban Transit Rail Application
| image = SCOMI Sutra for Rapid Rail.jpg
| imagealt = 
| caption = 4-car SUTRA trainsets used by [[KL Monorail]]
| interiorimage = Interior of KL Monorail Scomi SUTRA.jpg
| interiorimagealt = 
| interiorcaption = The interior of a SUTRA unit
| service = 2012–
| manufacturer = [[Scomi Rail]]
| ordernumber = 
| factory = [[Rawang, Selangor|Rawang Industrial Park]]
| family = 
| replaced = 
| yearconstruction = 
| yearservice = 
| refurbishment = 
| yearscrapped = 
| numberconstruction = 
| numberbuilt = 
| numberservice = 
| numberpreserved = 
| numberscrapped = 
| formation = 2–8 car sets
| diagram = 
| code = 
| fleetnumbers = 
| capacity = 20/139 (seated/standing) per car
| operator = {{plainlist|
* [[Rapid KL|Rapid Kuala Lumpur]]
* [[Mumbai Monorail]]
}}
| depots = 
| lines = 
| carbody = 
| trainlength = {{plainlist|
* 2 car: {{Convert|23.7|m|ftin|abbr=on}}
* 4 car: {{Convert|45.4|m|ftin|abbr=on}}
* 6 car: {{Convert|67|m|ftin|abbr=on}}
}}
| carlength = {{plainlist|
* {{Convert|11.2|m|ftin|abbr=on}} (end cars)
* {{Convert|9.5|m|ftin|abbr=on}} (intermediate cars)
}}
| width = {{Convert|3.08|m|ftin|abbr=on}} (incl. doors)
| height = {{Convert|4.72|m|ftin|abbr=on}}
| floorheight = {{Convert|2.1|m|ftin|abbr=on}}
| platformheight = 
| entrylevelorstep = 
| doors = 2 pairs per side
| wheeldiameter = {{convert|940|mm|abbr=on}}
| wheelbase = 
| maxspeed = {{convert|90|km/h|abbr=on}}
| weight = 15 tonnes per car<ref name="AutoCarIndia">{{cite web|url=http://www.autocarindia.com/auto-features/mumbai-monorail-the-future-is-here-371098.aspx/0|title=AutoCarIndia|accessdate=15 April 2015}}</ref>
| axleload = 
| traction = [[Variable frequency drive|Variable frequency]] ([[Insulated gate bipolar transistor|IGBT]])
| traction motors = 
| poweroutput = 
| tractiveeffort = 
| transmission = 
| acceleration = {{Convert|1.1|m/s2|abbr=on}}
| deceleration = {{plainlist|
* {{Convert|1.1|m/s2|abbr=on}} (service)
* {{Convert|1.3|m/s2|abbr=on}} (emergency)
}}
| aux = 
| powersupply = 
| hvac = 
| electricsystem = {{750 V DC|conductor=y}}
| collectionmethod = [[Current collector#Contact shoe|Contact shoe]]
| uicclass = 
| aarwheels = 
| bogies = 
| brakes = [[Regenerative braking|Regenerative]] and [[Electronically controlled pneumatic brakes|electro-pneumatic]]
| safety = 
| coupling = 
| multipleworking = 
| light = 
| gauge = 
| notes = 
}}
'''SUTRA''', abbreviation for '''Scomi Urban Transit Rail Application''', is a [[monorail]] [[electrical multiple unit]] (EMU) type train system designed by Malaysian rail company [[Scomi Rail]]. The design is currently the main product offering of Scomi Rail, which has won several contracts with the design, with the first customer being the [[Mumbai Monorail]] project.

In 2019 Scomi Rail was placed in receivership and it is no longer selling its monorail system.<ref>{{cite news|title=Scomi Rail placed under receivership |url=https://www.thestar.com.my/business/business-news/2019/05/09/scomi-rail-placed-under-receivership/|access-date=4 July 2021|work=The Star|date=9 May 2019}}</ref>

== Background ==
In late 2006, Scomi Rail decided to develop its own next generation monorail after gaining experience from the manufacture of the [[KL Monorail]] system. Within twelve months after commencing engineering design, on 26 November 2007, the SUTRA was unveiled by the then Malaysian deputy prime minister [[Najib Razak|Datuk Seri Najib Tun Razak]], who described the launch as "a significant milestone".<ref name="star1">{{cite web|url=http://www.thestar.com.my/story/?file=%2F2007%2F11%2F27%2Fnation%2F19585318&sec=nation|title=The star|accessdate=15 April 2015}}</ref>

The total investment expenditure spent by [[Scomi Rail]] for the SUTRA monorail was about RM35mil including for research, development and factory expansion.<ref name="star1"/>

== Design ==
The SUTRA complies with 50 international standards comprising safety, quality assurance, vehicle certification, reliability, availability and maintainability.<ref name="star1"/>

Compared to the previous design used in the [[KL Monorail]], the SUTRA has improved features such as a [[Composite material|composite]] body and interior panel, new [[bogie]] system and structure, mass transit components [[drive train]], improved propulsion and control system, and [[Regenerative brake|regenerative]] and [[Pneumatics|pneumatic brake]] system. The SUTRA is also more energy-efficient due to an improved direct-drive propulsion system and lower vehicle weight. The SUTRA also has a smaller turning radius of 50m<ref>{{Cite web |url=http://greg-vassilakos.com/monospec/monospec.htm |title=Specifications for Various Monorail Trains |access-date=15 July 2015 |archive-date=15 July 2015 |archive-url=https://web.archive.org/web/20150715231255/http://greg-vassilakos.com/monospec/monospec.htm |url-status=dead }}</ref> and can also handle gradients on a slope of up to six degrees.<ref>{{cite web|url=http://www.scomigroup.com.my/media/Newsletter/focus19.pdf|title=Scomi|accessdate=15 April 2015}}</ref> The SUTRA also features couplings for up to eight cars that have a capacity of 1,050 passengers.<ref>{{cite web|url=http://www.thestar.com.my/story/?file=%2F2012%2F5%2F7%2Fmetrobiz%2F11225685|title=The Star|accessdate=16 April 2015}}</ref>

=== General ===
[[File:Monorail new train 1.jpg|thumb|The Scomi SUTRA being manufactured]]
The SUTRA is a highly customisable design, and is designed to accommodate two to eight cars per set, with capacity ranging from 6,400 [[pphpd]] in the four-car [[KL Monorail]] to 36,000 in the 5/6-car [[Line 17 (São Paulo Metro)]] and [[Manaus Monorail]].

The [[monocoque]] (load-bearing single-shell frame) body structure of the SUTRA is constructed with [[aluminium extrusion]] materials. The lightweight structure combined with the aluminium apron structure provides enhanced strength and durability of up to 30 years.<ref name="brochure">{{cite web | url=http://www.scomirail.com.my/pdf/Scomi_Rail_Product_Brochure.pdf | title=Scomi Rail brochure | accessdate=15 April 2015}}</ref>

The SUTRA's propulsion is provided by an [[electric motor]] with [[Gear reduction|gear reducers]] which draws power from the 750 V DC power line. The motor of the SUTRA is fitted with a [[Variable-frequency drive|variable-voltage-variable-frequency]] (VVVF) drive which is fine-tuned for smooth acceleration / deceleration. The VVVF has high torque and duty cycle capabilities, rated at a power of 200 [[kW]].<ref name="brochure"/>

The brake system consists of [[Electro-pneumatic brake|electro-pneumatic]] systems and [[regenerative brake]]s, providing multiple uses including high integrity [[Emergency brake (train)|emergency brake]]s, service brakes, security brakes and parking brakes.<ref name="brochure"/>

The SUTRA has an automatic [[Railway coupling|coupling]] system that can connect up to eight cars together. The coupling system is also capable of towing another SUTRA during emergency connections and is also designed to absorb impact energy in case of accidents.<ref name="brochure"/>

=== Interior ===
The interior of the SUTRA is customisable, and was designed with the consideration of passenger safety and comfort. It was designed with a minimalist concept with the aim of increased interior space and maximised flow of passengers and minimised obstruction in and around doorways.<ref name="brochure"/>

[[Hand railing|Hand rails]] and [[stanchion]]s are available to assist safe boarding, seating, standing and alighting assistance, including for persons with disabilities.<ref name="brochure"/> Other safety features include an emergency door release knob and emergency passenger intercom as well as emergency ventilation windows.

The flooring of the SUTRA is slip-resistant and made of [[fire-retardant]] material. Each car has a 40&nbsp;kW roof mounted air conditioning unit. Passenger information systems include [[LED]] texts and television screens in addition to [[Audio system|audio]] announcements.<ref name="brochure"/>

The cabs are equipped with specially designed mass transit seats and two adjacent flippable seats as well as a disabled wheelchair area, which also functions as a standing area when not utilised. Similar to the previous generation Scomi monorails, there are center seats which also function as [[bogie]] covers.<ref name="brochure"/><ref>{{cite web | url=http://railtravelstation.com/2015/01/05/rapidkl-4-car-monorail/ | title=RailTravelStation | date=5 January 2015 | accessdate=16 April 2015}}</ref>

=== Vehicle management ===
[[File:Mumbai Monorail Cab.jpg|thumb|Driver's cab of the SUTRA with the vehicle management system visible]]
The vehicle management system (VMS) provides supervised control, monitoring and diagnostic systems for train operators.<ref name="brochure"/>

Train status information is graphically displayed to the operator via the [[User interface|HMI]] panel. The user-friendly interface display allows the operator to quickly respond and understand all train system status.<ref name="brochure"/>

The train system status and abnormal conditions are categorised and displayed in real time and prioritised in order of critical system hierarchy. As an option, critical data can be logged for further analysis.<ref name="brochure"/>

The train is equipped with [[automatic train protection]] (ATP) system to prevent collisions. The ATP system can be optionally upgraded to an [[automatic train operation]] (ATO) system to automate operations of the monorail.<ref name="brochure"/>

== Users ==
[[File:Metro, Traffic, Birds (12151012426).jpg|thumb|SUTRA's first user, the [[Mumbai Monorail]]]]

=== Operational ===
*[[KL Monorail]] – [[Kuala Lumpur]], Malaysia
**Quantity: 12 units of 4-car sets on order. Only 6 units delivered. All 6 were taken out of service in May 2017 due to safety reason.<ref>{{Cite web|url=http://www.thestar.com.my/news/nation/2017/06/07/rapid-rail-grounds-four-car-monorail-trains-for-safety-reasons/#TLWIzcTJKCGolD51.99|title=Rapid Rail grounds four-car monorail trains for safety reasons|archive-url=https://web.archive.org/web/20170607070331/http://www.thestar.com.my/news/nation/2017/06/07/rapid-rail-grounds-four-car-monorail-trains-for-safety-reasons/#TLWIzcTJKCGolD51.99|archive-date=2017-06-07|url-status=dead}}</ref> 
**Capacity: 6,400 [[pphpd]]<ref>{{cite web | url=http://www.thestar.com.my/Business/Business-News/2014/07/19/The-Sao-Paulo-door-opener-Brazilian-project-is-Scomi-Engineerings-muchawaited-breakthrough/?style=biz | title=The Star | accessdate=15 April 2015}}</ref>
*[[Mumbai Monorail]] - [[Mumbai]], India 
**Quantity: 16 units of 4-car sets<ref name="AutoCarIndia"/>
**Capacity: 10,000 [[pphpd]]<ref name="AutoCarIndia"/>

=== Contracted ===
''a contract was signed in 2012 but the project never began construction''
* [[Manaus Monorail]] – [[Manaus]], Brazil<ref>{{usurped|1=[https://web.archive.org/web/20130816162902/http://www.scomigroup.com/weboffice/files/news/892011_43514PM_SEB_Manaus%20Project_08082011.pdf Article title]}} ''News clipping released by Scomi group'', 6 August 2011, retrieved 30 July 2012</ref>
**Quantity: 10 units of 6-car sets
**Capacity: 36,000 [[pphpd]].<ref name="pphpd"/>  On hold.

===Cancelled===
* [[Line 17 (São Paulo Metro)]] – [[São Paulo]], Brazil<ref>{{usurped|1=[https://web.archive.org/web/20130816164356/http://www.scomigroup.com/weboffice/files/news/672011_32838PM_Microsoft%20Word%20-%20SEB_Brazil%20(papers)%2006.06.pdf Article title]}} ''News clipping released by Scomi group'', 6 June 2011, retrieved 30 July 2012</ref>  Contract with Scomi terminated for non-performance in 2019, awarding to [[BYD Company|BYD]] instead.<ref>{{Cite web|url=https://g1.globo.com/sp/sao-paulo/noticia/2019/03/22/metro-rescinde-contrato-de-construcao-do-monotrilho-da-linha-17-ouro.ghtml|title = Metrô rescinde contrato de construção do monotrilho da Linha 17-Ouro}}</ref>
**Quantity: 24 units of 3-car sets upgradeable to 18 units of 5-car sets<ref>{{cite web | url=http://biblioteca.aeamesp.org.br/smns/19smtf130911T07ap.pdf | title=Biblioteca | accessdate=16 April 2015}}</ref>
**Capacity: 36,000 [[pphpd]]<ref name="pphpd">{{cite web | url=http://www.thestar.com.my/Business/Business-News/2014/07/19/The-Sao-Paulo-door-opener-Brazilian-project-is-Scomi-Engineerings-muchawaited-breakthrough/?style=biz | title=The Star | accessdate=16 April 2015}}</ref>
* [[Line 18 (São Paulo Metro)]] – [[São Paulo]], Brazil
**Quantity: Unconfirmed number of 5-car sets.<ref>{{cite web | url=http://www.scomigroup.com/weboffice/files/news/7162014_81220AM_MNR_SEB%20Line%2018%2015072014.pdf | archive-url=https://web.archive.org/web/20150125012236/http://www.scomigroup.com/weboffice/files/news/7162014_81220AM_MNR_SEB%20Line%2018%2015072014.pdf | url-status=usurped | archive-date=25 January 2015 | title=ScomiGroup | accessdate=12 April 2015 }}</ref><ref>{{cite web | url=http://www.thesundaily.my/news/1115140 | title=TheSunDaily | accessdate=14 April 2015}}</ref>  Line cancelled.
**Capacity: 21,000 [[pphpd]]<ref name="pphpd"/>

==References==
{{reflist|2}}
{{Rail transport in Malaysia}}

[[Category:Mumbai Monorail]]
[[Category:750 V DC multiple units]]
[[Category:Electric multiple units of Malaysia]]
[[Category:Electric multiple units of India]]