Siemens C651

Siemens AG (SIE) C651
Siemens AG (SIE) C651
	A Siemens C651 train.
	Interior of a Siemens C651 train
Stock type	Electric multiple unit
In service	2 May 1995 – 30 September 2024 (29 years, 151 days)
Manufacturer	Siemens Mobility, SGP Verkehrstechnik
Assembly	Vienna, Austria
Constructed	1994 – 1995
Entered service	2 May 1995
Refurbished	Singapore Rail Engineering (SRE); 2016 – 2018
Retired	27 November 2024
Scrapped	September 2020 – November 2024
Number built	114 vehicles (19 sets)
Number preserved	6 vehicles
Number scrapped	108 vehicles
Successor	Alstom Movia R151
Formation	6 per trainset; DT–M1–M2+M2–M1–DT
Fleet numbers	201/202 – 237/238
Capacity	1920 passengers
Operators	SMRT Trains (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	3.7 m (12 ft 1+5⁄8 in)
Doors	1,450 mm (57+1⁄8 in), 8 per car, 4 per side
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	35 t (34 long tons; 39 short tons) (unladen); 53.8 t (53.0 long tons; 59.3 short tons) (laden);
Axle load	16 t (16 long tons; 18 short tons)
Traction system	Siemens PWM GTO–VVVF
Traction motors	16 × Siemens 140 kW (190 hp) 3-phase AC induction motor w/ enclosed-ventilated lateral drive
Power output	2.24 MW (3,000 hp)
Transmission	5.94 : 1 (107 / 18) gear ratio
Acceleration	1 m/s2 (3.3 ft/s2)
Auxiliaries	110 V DC
Electric system(s)	750 V DC third rail
Current collector(s)	Collector shoe
UIC classification	2′2′+Bo′Bo′+Bo′Bo′+Bo′Bo′+Bo′Bo′+2′2′
Bogies	Duewag SF 2100
Braking system(s)	1st service brake: Self-excited, mixed service and resistor brake; 2nd service brake: Pneumatic compressed air wheel tyre block brake; Parking brake: Compressed air pressure spring-loaded brake;
Safety system(s)	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 coupler
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The Siemens C651 was the second generation electric multiple unit rolling stock that operated on the North–South and East–West lines of Singapore's Mass Rapid Transit (MRT) system, manufactured by Siemens Mobility (SIE) and SGP Verkehrstechnik in Vienna, Austria under Contract 651. A total of 114 cars consisting of 19 trainsets were purchased in 1992 and were in service from May 1995 to September 2024.