Kawasaki Heavy Industries & Nippon Sharyo C751B cars are part of the newest 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.

Interior
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 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 through service to Changi Airport was cancelled and replaced by a shuttle service to and from Tanah Merah station, dismishing the need to provide these racks for non-airport bound train services. Therefore, in 2003, trains with the luggage racks had their luggage racks removed, and replaced with an empty standing area, with a dual purpose of serving as a wheelchair area.

Serial number

Length of train : 138 m (23 m per car)
Width of car   : 3.2 m
Height of car  : 3.7 m
Weight of car : 35,000 kg
Number of passengers seated per train: 300 per train
Number of passengers standing : 1,428 per train
Maximum passenger load : 1,920 or 320 per car
Average speed  : 45 km per hour
Maximum service speed : 80 km per hour
Maximum speed : 90 km per hour
Track gauge   : 1,435 mm
Track Voltage : 750 volts DC third rail
Train formation : Two sets of three-car Electric Multiple Units (EMUs) which are permanently-coupled, providing for driving cabs at either end of trains and four motorised-cars in the middle.
Train consist : 6 car unit (Semi-permanently coupled)
Control system : VVVF IGBT inverter
Primary power : 750V DC supplied from third rail
Dimensions : 23,830 mm (L) 3,200 mm (W) 3,693 mm (H)