Kawasaki Heavy Industries & Nippon Sharyo C751B
|Kawasaki-Nippon Sharyo C751B|
An SMRT C751B train at Eunos.
Interior of a C751B motor compartment.
|In service||28 January 2000–|
|Manufacturer||Kawasaki Heavy Industries and Nippon Sharyo|
|Formation||6 per trainset
|Operator||SMRT Trains (SMRT Corporation)|
|Depot(s)||Bishan, Changi and Ulu Pandan|
|Line(s) served||North South Line
East West Line
|Car body construction||Aluminium-alloy double-skinned construction|
|Car length||23 m|
|Doors||1.45m, 8 per car|
|Maximum speed||90 km/h (Design)
80 km/h (Service)
|Weight||34.8 t (DT)
39 t (M1/M2)
|Traction system||IGBT-VVVF (Fuji Electric)
Output 415 kVA
2 units per motor car (1C2M)
|Engine(s)||Fuji Electric MLR109
Self-Ventilated Three-Phase AC Induction Motor
(550V 193A 1760 r/min)
|Transmission||WN (Westinghouse-Natal) Drive|
|Deceleration||3.6 km/h/s (Service Maximum)
4.68 km/h/s (Emergency)
|Auxiliaries||IGBT-VVVF (Fuji Electric) Auxilary Inverter with Battery Charger
80 kVA + 16 kW
|Electric system(s)||750 V DC 3rd rail|
|Bogies||Bolsterless Air Spring (Monolink Axlebox Type)|
|Safety system(s)||ATC and ATP|
|Track gauge||1,435 mm (4 ft 8 1⁄2 in) standard gauge|
Kawasaki Heavy Industries & Nippon Sharyo C751B is the third rolling stock used in Singapore's original Mass Rapid Transit network, operating on the North South Line and the East West Line since early 2000. 21 trainsets of 6 cars each were purchased, and it is the first rolling stock to feature VVVF insulated-gate bipolar transistor traction control system. Kawasaki Heavy Industries manufactured 66 cars and Nippon Sharyo manufactured 60 cars respectively with no comparable differences, having built to agreed specifications. These trains are the third generation of rolling stock to be used on the two lines.
The most prominent difference between these trains, and trains of the older generation, such as the C151 trains before refurbishment, are in terms of its exterior design and colours. The front of the train sports a more slanted and streamlined look, with the run number display in Orange LED Display. The sides of the train, instead of having the conventional white background with a red stripe, consists of a shiny black area covering the middle portion of the train from just above the windows to below the windows, followed by a bold red stripe and a thinner grey stripe at the bottom of the train.
All cars are equipped with 6 LCD per car (which have since been deactivated), and all except trainset 347/348 which features LED displays (which have been replaced by the VFDs of the STARIS). These used to show rail travel information, commercials and movie trailers. They also come with more grab poles, wider seats, more space near the doors and wheelchair space. The interior and exterior design of the train have been improved, incorporating a much sleeker design. The LEDs however have seen little usage after a new series of voice announcements were introduced across the system in mid-2008. All VPIS were removed to make way for the STARIS by 2010. In 2013, support bars are added to the seats with hand grips, and the middle handrails with hand grips are configured to join across nearly one carriage, as such all grabpoles that branched out into three are replaced by regular single grabpoles.
The colour layout on these trains are also different from their earlier counterparts. Cars 1 and 6 use a sort of pinkish-purple color on the seats, while cars 2 and 5 use a different shade of blue, and the middle cars using a bluish-green. All door panels and walls are white, which was subsequently adopted in the refurbishment of the C151 trains.
Main Propulsion Controller/Motor
The C751B trains is the second commuter type Electric Multiple Unit (EMU) made in Japan to feature electric systems fully manufactured by Fuji Electric. Propulsion is controlled by VVVF Inverter with 2-level insulated-gate bipolar transistor semiconductor controller, rated at 415 kVA. Each inverter unit controls two motors on one bogie (1C2M), and one motor car features two of such units. Motors are three-phrase AC induction type, model MLR109, with a maximum output of 140 kW.
The C751B trains uses the monolink axlebox type bolsterless air spring bogie. There are no major technical difference between a trailer and motor car bogie other than additional electrical components for the latter.
A break from tradition, the C751B trains features auxiliary inverters for its electrical systems on all six cars of the train. Previously, auxiliary inverters are mounted only on motor cars. The VVVF Inverter is controlled by insulated-gate bipolar transistor semiconductors and rated at 80 kVA. A battery charger is built with the inverter and provides 16 kW output.
In 2001, when the Changi Airport Line was opened, some of these trains plying the East West Line had luggage racks installed. These luggage racks were installed in every carriage of the train, taking up the space of two seats next to the door at the end of each carriage. The purpose of those racks were to let travellers heading to the airport, who usually carry a large amount of luggage, to have a space to place their bags easily.
However, these luggage racks were always underutilised. Travellers preferred holding on to their bags where they were standing or sitting, as opposed to placing them on the luggage racks, probably due to convenience and fear of theft. Some commuters were also complaining that these racks took up critically needed space which could be occupied by other passengers which often filled the train. Furthermore, the service to Changi Airport was cancelled and replaced by a shuttle service to and from Tanah Merah station, dismissing the need to provide these racks for non-airport bound train services. Therefore, in 2003, trains with the luggage racks had them removed, and replaced with an empty standing area, with a dual purpose of serving as a wheelchair area.
Train withdrawal incidents
On 13 April 2002, a fault was detected in a C751B train and it was subsequently withdrawn to Changi Depot for investigations. As the train was under warranty, the engineers from the manufacturers of the train and gearbox were flown in on 21 April. They subsequently detected metal fragments in the gearboxes, along with other 20 trains. SMRT immediately withdrew all 21 C751B trains and suspended the Boon Lay – Changi Airport train through service, replacing it with the Tanah Merah – Changi Airport shuttle service. Train frequencies were also adjusted until early May when 8 trains returned to service. By June 2002, all C751B trains had return to service and the through service was resumed.
SMRT Active Route Map Information System (STARiS)
All C751B trains are installed with STARiS and are operational since late 2010.
Kawasaki Heavy Industries & Nippon Sharyo C751B trains are equipped with Automatic Train Control (ATC), supplemented with Automatic train operation (ATO). At a fallback level, Automatic Train Protection (ATP) is available.
The car numbers of the trains range from x311 to x352, where x depends on the carriage type. Individual cars are assigned a 4 digit serial number by the rail operator SMRT Trains.
- The first digit depends upon whether the car is the first, second or third car from the end of the train it is nearer to, where the first car has a 3, the second has a 1 & the third has a 2.
- The other 3 digits are the train identification numbers. A full length train of 6 cars have 2 different identification numbers, one for the first 3 cars, and the same number plus 1, for the other three.
- Kawasaki Heavy Industries built sets 311/312, 315/316, 319/320, 323/324, 327/328 – 333/334, 343/344, 347/348 and 351/352.
- Nippon Sharyo co-built sets 313/314, 317/318, 321/322, 325/326, 335/336 – 341/342, 345/346 and 349/350.
- "EMU Trains for the Singapore Land Transport Authority". Kawasaki Heavy Industries. Retrieved 5 November 2012.
|Wikimedia Commons has media related to Mass Rapid Transit (Singapore)#Trains.|
- Manufacturer's Information for C751B, Kawasaki Heavy Industries 日本語
- Manufacturer's Information for C751B, Nippon Sharyo 日本語
- Main fleet info for C751Bs