The Siemens C651 trains are the second generation of rolling stock for the North-South and East-West Lines.
19 trains of six cars each were purchased to complement the opening of the Woodlands extension in 1996. The trains have been in passenger service since 2 May 1995, and are housed in Bishan, Ulu Pandan, Changi and Tuas Depots.
The motors of these trains produces a melodious sound when it is accelerating or braking.
Built 1993 - 1994
19 trains of 6 cars each, numbered 201/202 to 237/238
Contract 651 for the design and building of 19 trains was awarded to Siemens AG.
The SIE trains were bought to complement with the opening of the Woodlands extension and entered service on 2 May 1995. The increase in rail length meant that more trains are needed to maintain train frequencies.
In 2016, the SIE trains were upgraded to be equipped with Thales SelTrac Communications-Based Train Control (CBTC) signalling system under the Re-Signalling Project. With the upgrade, two seats from both ends of the train are replaced with a signalling box, housing the new signalling equipments.
These trains will undergo the Mid-Life Refurbishment Programme from 2016 to 2018. Apart from improved interior changes, the refurbished trains will feature new or refurbished train sub-systems, such as new air-conditioning, electric doors, brakes and propulsion system. The changes will include refurbishing the propulsion system, air-conditioning system, auxiliary power system, interior saloon and exterior of the trains.
The new IGBT-VVVF Permanent Magnet Synchronous Motors (PMSM) from Toshiba will also replace the original GTO-VVVF traction control from Siemens AG as part of the Mid-Life Refurbishment Programme. With the new motors, power consumption is expected to be cut by 30%, operating noise levels will also be reduced by up to 12dB and the operating efficiency of the trains will be increased.
The first refurbished train is expected to be completed in early 2017, and all 19 trains to be completed by Summer 2018.
SMRT announced on 16 September 2018 that the refurbishment of the Siemens C651 trains will be discontinued.
The SIE trains carry a bright exterior livery: a white background, with a red band down the middle. It is coated with a scratch-resistant acrylic finish.
The train numbers are displayed on an electronic green flip-dot display at the top of the right windscreen.
High-friction flooring is installed at every doorways to prevent passengers from slipping when entering or exiting the train.
A single row of hand grips is positioned along the aisles of the train cabins to provide standing passengers with increased support.
STARiS is installed in all SIE trains.
It provides commuters with their route information throughout their journey, and indicates which side the doors will open.
Three seats per row in the second and fifth cars were removed to provide more standing area beside the doors.
This programme is experimented in the blue cars of selected SIE trains.
Two additional single vertical poles were placed in the centre to encourage passengers to utilise the space in the centre of the car.
This programme is experimented in train car 2238.
Regular grab poles in the centre were replaced by triplicated grab poles.
Three variations of triplicated grab poles were experimented in selected SIE trains, but only one design remains.
Handrails were modified as a trial by LTA to encourage more commuters to move towards the centre of the car.
This programme is experimented in train car 2212.
Seats in the middle of the car were removed and were replaced by green bum rests with a soft finish to provide more standing space.
These bum rests were eventually removed.
DT: Driving Trailer (unpowered); M1/M2: Motor car