Kawasaki Heavy Industries & Nippon Sharyo C751B

Kawasaki Heavy Industries & Nippon Sharyo (KNS) C751B
A C751B trainset at Eunos.
Interior of a C751B motor compartment.
In service 8 May 2000 (2000-05-08) – Present
Manufacturer Kawasaki Heavy Industries and Nippon Sharyo
Built at Kobe, Japan
Constructed 1999 – 2001
Entered service 2000
Number built 126 vehicles (21 trainsets)
Number in service 126 vehicles (21 trainsets)
Formation 6 per trainset
DT–M1–M2–M2–M1–DT
Fleet numbers 311/312 ~ 351/352
Capacity 1920 passengers
276/288 seats
Operator(s) SMRT Trains (SMRT Corporation)
Depot(s) Bishan
Changi
Tuas
Ulu Pandan
East Coast (Future)
Line(s) served  EWL  East West Line
 NSL  North South Line
Specifications
Car body construction Aluminium-alloy double-skinned construction
Car length 23 m (75 ft 5 1⁄2 in)
Width 3.2 m (10 ft 6 in)
Height 3.7 m (12 ft 1 5⁄8 in)
Doors 1,450 mm (57 1⁄16 in), 8 per car
Maximum speed 90 km/h (56 mph) (design)
80 km/h (50 mph) (service)
Weight 222.8 t (219.3 long tons; 245.6 short tons) (DT)
320.3 t (315.2 long tons; 353.1 short tons) (laden)
Traction system IGBT-VVVF (Fuji Electric)
Output 415 kVA
(2 units per motor car (1C2M))
Traction motors Fuji Electric MLR109 Self-Ventilated Three-Phase AC Induction Motor
( 140 kW (190 hp) 550V 193A 1760 r/min
Power output 2.24 MW (3,000 hp) )
Transmission Westinghouse-Natal (WN) Drive
Acceleration 1.0 m/s2 (3.3 ft/s2)
Deceleration 1.3 m/s2 (4.3 ft/s2) (service)
Auxiliaries IGBT-VVVF (Fuji Electric) Auxiliary Inverter with Battery Charger
80 kVA + 16 kW
Electric system(s) 750 V DC Third rail
Current collection method Collector Shoe
Bogies Bolsterless Air Spring (Monolink Axlebox Type)
Braking system(s) Regenerative Braking, Air Brakes
Safety system(s) Current: Thales SelTrac® Moving Block CBTC ATC with subsystems of ATO GOA 3 (DTO), ATP, NetTrac ATS, CBI[1]
Past: Westinghouse Brake and Signal Company Ltd fixed block ATC with subsystems of ATO GOA 2 (STO), ATP, ATS
Track gauge 1,435 mm (4 ft 8 1⁄2 in) standard gauge

The Kawasaki Heavy Industries & Nippon Sharyo C751B, sometimes abbreviated to C751B or KNS C751B is the third generation Electric multiple unit rolling stock in operation on the North South and East West Lines of Singapore's Mass Rapid Transit (MRT) system since early 2000.[2] 21 trainsets of 6 cars each were purchased at S$231 million, and it is the first rolling stock to feature VVVF insulated-gate bipolar transistor traction control system, and the traction system was similar to Sanyo 5030 series. 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.

Design

Exterior design

The front of the train sports a more slanted and streamlined look, with the run number display in Orange LED Display. The C751B train is the first train to have the updated SMRT livery that ran between 1999 and 2014. It is the 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. These trains were fitted with Mobitec MobiLED electronic destination displays for train run numbers.

Interior design

Label in C751B train in Singapore, showing logo of Nippon Sharyo

All cars have been retrofitted with 6 LCD displays per car, and all except trainset 347/348 which features VPIS (Visual Passenger Information System) displays from July 2001 to September 2009. These used to show rail travel information, commercials and movie trailers. The C751B is also the first train to have wheelchair space, with the retrofitting of the elevators in the MRT stations began in 2000. The interior design have been improved as it is the first batch of modernised trains.[3]

The LCD screens were deactivated since July 2007 and LED displays was not used since January 2008 with the change of voice announcer. 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 is a standard appearance of all SMRT trains.[3]

Equipment

Main Propulsion Controller/Motor

The C751B 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 IGBT 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.

Bogies

The C751B 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.

Auxiliary Systems

A break from tradition, the C751B 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 IGBT semiconductors and rated at 80 kVA. A battery charger is built with the inverter and provides 16 kW output.

Experimental programmes

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.

Energy efficient LED lights are on trial in train car 1328 and 3328.

STARIS Version 2.0 was installed in 2010 but however it was uninstalled in 2016.

Operational incidents

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, and those of another 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 end of May 2002, all C751B trains had been returned to service and the through service was resumed.[4]

In August 2011, a security breach occurred at the Bishan Depot and c751b set 311/312 was heading northbound and had to be removed from service

Train Formation

The configuration of a C751B in revenue service is DT-M1-M2-M2-M1-DT

Cars of C751B
car type Driver Cab Motor Collector Shoe car length Wheelchair Space
mm ft in
DT✓✗✓ 23,830 78 ft 2.2 in✓
M1✗✓✓ 22,800 74 ft 9.6 in✓
M2✗✓✓ 22,800 74 ft 9.6 in✓

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. A complete six-car trainset consists of an identical twin set of one driving trailer(DT) and two motor cars(M1 & M2) permanently coupled together. For example, set 345/346 consists of carriages 3345, 1345, 2345, 2346, 1346 and 3346

  • The first digit identifies the car number, where the trailer cars has a 3, the second and fifth cars has a 1 & the middle cars has a 2.
  • The second digit is always a 3, part of the identification numbers
  • The third digit and fourth digit are the train identification numbers. A full length train of 6 cars have 2 different identification numbers. For example, 345/346 (normal coupling) or 345/352 (cross coupling).
    • Kawasaki Heavy Industries built sets 311-312, 315-316, 319-320, 323-324, 327-334, 343-344, 347-348 and 351-352.
    • Nippon Sharyo co-built sets 313-314, 317-318, 321-322, 325-326, 335-342, 345-346 and 349-350.

The reason why they used 311/312 instead of 301/302 is because of the Money train on Kawasaki Heavy Industries C151 whose car numbers are 301/302 but they were sold to Singapore Armed Forces.

References

  1. ↑ Fang, Joy (2 February 2012). "Coming: $600m upgrade for MRT system/New train measures a 'catch-up'". My Paper. pp. A2, A6. Archived from the original on 18 May 2015. Retrieved 13 May 2015.
  2. ↑ "EMU Trains for the Singapore Land Transport Authority". Kawasaki Heavy Industries. Retrieved 5 November 2012.
  3. 1 2 "SMRT widens seats as people are now bigger". The Straits Times. 26 September 1999. Retrieved 29 July 2018. Bigger seats mean fewer seats in new trains but with more standing space, capacity will be the same. PEOPLE here have been getting bigger, so the Land Transport Authority (LTA) has widened the seats in the new Mass Rapid Transit (MRT) train carriages. The seats are now 48 cms wide - about 5 cms wider than before, said Mr Chew Tai Chong, the LTA's director, projects and engineering, when the new carriage was unveiled yesterday."; "The bigger seats are but one of the many new features in the new carriages. Some of the others are:* More space next to the door of the train: This is a popular standing spot for many commuters and people have complained about crowding near the spot, which makes it hard to enter or leave the carriage.* Three-way grab-poles: These will allow more standing passengers to have something to hang on to. * New fans: These have also been built into the ceiling of each carriage. * Warning lamps at doorways: These will be in addition to the current beeps that signal that doors are closing. * Lower emergency button: The button to talk to the driver, previously 1.9 metres above the floor, is now 1.5 metres high. The change was made to cater to special needs, such as those who are wheelchair-bound.* Smaller gap between carriages: The gap between carriages has been cut, and the space blocked with barriers, so that a visually-impaired passenger will not mistake it for a train door. * New colours: The exterior will be black, red and white, and the floors will be green. The seats will come in three colours - fuschia, green and blue, with a green floor."; "The deputy managing director of SMRT, Dr Fong Seck Kong, said the trains, comprising six carriages each, will also be more energy efficient. Each train will use 3 per cent less electricity than the current trains. He said this can bring big savings as its 85 MRT trains now chalk up an annual electricity bill of about $12 million. The 16 new trains cost $11 million each and they will be delivered over a year in stages from Japan.
  4. ↑ "21 MRT trains withdrawn Longer wait for trains". The New Paper. 23 April 2002. Retrieved 29 July 2018.

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