Kawasaki Heavy Industries C151

Kawasaki Heavy Industries (KHI) C151
Kawasaki Heavy Industries (KHI) C151
	A Kawasaki C151 train before refurbishment A refurbished Kawasaki C151 train
	Interior of a Kawasaki C151 before refurbishment Interior of a refurbished Kawasaki C151
Stock type	Electric multiple unit
In service	7 November 1987 – 26 September 2025 (37 years, 323 days)
Manufacturers	Kawasaki Heavy Industries (with Kinki Sharyo Co., Ltd., Nippon Sharyo, Ltd. and Tokyu Car Corporation)
Built at	Kobe, Hyogo, Japan
Constructed	1986–1989
Entered service	7 November 1987
Refurbished	Hyundai Rotem (with Mitsui); 2006–2008
Retired	26 September 2025
Number built	396 vehicles (66 sets) + 2 extra driving trailers for the cash train
Number retired	366 vehicles (61 sets) + 2 extra driving trailers for the money train
Number preserved	10 vehicles
Number scrapped	353 vehicles
Successor	Alstom Movia R151
Formation	6 cars per trainset; DT–M1–M2+M2–M1–DT
Fleet numbers	001/002 – 131/132 (regular six-car trainsets); 301/302 (2 extra driving trailers for cash transport);
Capacity	1920 passengers 372 seats (as built); 296 seats (first refurbishment); 212 seats (middle seats removed); 208 seats (CBTC installation);
Operator	SMRT Trains Ltd (SMRT Corporation)
Depots	Bishan; Ulu Pandan; Tuas; Changi;
Lines served	NSL North–South Line; EWL East–West Line;
Specifications
Car body construction	Aluminium-alloy double-skinned construction
Train length	138.5 m (454 ft 4+3⁄4 in)
Car length	23.65 m (77 ft 7 in) (DT); 22.8 m (74 ft 10 in) (M);
Width	3.2 m (10 ft 6 in)
Height	3.69 m (12 ft 1+1⁄4 in)
Doors	1,450 mm (57+1⁄16 in), 8 per car
Wheel diameter	850–775 mm (33.5–30.5 in) (new–worn)
Wheelbase	2,500 mm (98 in)
Maximum speed	90 km/h (56 mph) (design); 80 km/h (50 mph) (service);
Weight	21.7 t (21.4 long tons; 23.9 short tons) (DT); 38.3 t (37.7 long tons; 42.2 short tons) (M1); 38.4 t (37.8 long tons; 42.3 short tons) (M2);
Axle load	16 t (16 long tons; 18 short tons)
Traction system	As built: Mitsubishi GTO–4-quadrant chopper control; Upgraded: Toshiba IGBT–VVVF;
Traction motors	As built: 16 × Mitsubishi 145 kW (194 hp) 2-phase DC shunt-wound motor (1 hour rating: 375 V 430 A 2050 rpm); Upgraded: Toshiba permanent-magnet synchronous motor;
Power output	As built: 2.32 MW (3,111 hp)
Transmission	Westinghouse-Natal (WN) drive; gear ratio: 6.57 : 1 (92 / 14)
Acceleration	1 m/s2 (2.2 mph/s)
Deceleration	1 m/s2 (2.2 mph/s) (service); 1.3 m/s2 (2.9 mph/s) (emergency);
Electric systems	750 V DC third rail
Current collection	Collector shoe
UIC classification	2′2′+Bo′Bo′+Bo′Bo′+Bo′Bo′+Bo′Bo′+2′2′
Bogies	Duewag SF 2100
Braking systems	Westinghouse Brake & Signal electro-pneumatic, regenerative and rheostatic
Safety systems	Original: Westinghouse Brake and Signal Company FS2000 ATP fixed block ATC under ATO GoA 2 (STO), with subsystems of ATP and ATS; Current: Thales SelTrac® moving block CBTC ATC under ATO GoA 3 (DTO), with subsystems of ATP, NetTrac ATS and CBI;
Coupling system	Scharfenberg
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The Kawasaki Heavy Industries (KHI) C151 were the first generation of electric multiple unit (EMU) rolling stock that operated on the North–South and East–West lines of Singapore's Mass Rapid Transit (MRT) system, manufactured by a consortium led by Kawasaki Heavy Industries (KHI) under Contract 151. They were first introduced in 1987 and retired in 2025, making them the oldest trains operated on the network.

Sixty-six trainsets consisting of six cars each and a single money train set consisting of four cars were contracted in 1984. They were manufactured from 1986 to 1989 in two batches by a Japanese consortium consisting of the namesake Kawasaki, Kinki Sharyo, Nippon Sharyo and Tokyu Car Corp following a round of intense competitive bidding by international rolling stock manufacturers.

The trains underwent a two-year mid-life interior refurbishment programme by Hyundai Rotem. After the 2011 major train disruptions on 15 and 17 December 2011, further plans to upgrade its mechanical components to increase its reliability were made. The first two trainsets to receive this upgrade, which included a replacement traction system to PMSM, entered service in July 2015. In total, 6 trains were fitted with the PMSM system by Toshiba. From June 2023, the R151 trains began replacing the C151 trains, with the latter being entirely superseded by September 2025.