Siemens C651 (SIE)

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.

These trains are well known for its melodious sound produced by the propulsion system during acceleration and braking.


At a Glance

Siemens C651

North-South Line

East-West Line

Built 1993 - 1994

19 trains of 6 cars each, numbered 201/202 to 237/238

Trains maintained by SMRT Trains


Contract 651 for the design and building of 19 trains was awarded to Siemens Aktiengsellschaft on 14 October 1992.

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.

Refurbishment and Upgrading

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.

Replacement of SIE trains

An initial contract for the replacement trains for the existing 66 first generation KHI C151 trains was awarded to Bombardier on 25 July 2018. The Land Transport Authority announced on 28 September 2020 that 40 additional Bombardier MOVIA trains was purchased to replace the existing 19 SIE and 21 KNS trains. These new trains uses the same design as the R151 and will arrive in batches starting from 2024.





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.


There are three colour schemes in the train cars, with each colour applied to two cars of the train.

From the train ends to the middle cars, they are coloured mandarin orange, porcelain blue and emerald green.


High-Friction Flooring

High-Friction flooring

High-friction flooring is installed at every doorways to prevent passengers from slipping when entering or exiting the train.

Overhead Hand Grips

Overhead Hand Grips

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.

Read more >

Emergency Exits

Emergency Exits

Emergency exits are located at both ends of the train.

The emergency exit ramp will be deployed in an emergency.

Emergency Communication Button

Emergency Communication Button

Emergency Communication Buttons are located at the side of the train doors to contact the train staff in an emergency.


Stand-Back Area

Standback Area

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.

Additional Grab Poles

Additional Grab Poles

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.

Triplicated Grab Poles

Triplicated Grab Poles

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.

Modified Flooring

Modified Flooring

Two variations of special non-slip flooring is experimented in train cars 2237 and 1237.

Modification of Handrails

Modification of Handrails

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.

Padded Bum Rests

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.

Technical Specifications


DT: Driving Trailer (unpowered); M1/M2: Motor car

Siemens AG
Number Built
114 cars (19 trains)
Train Numbers
201/202 - 237/238
Car Body Construction
Aluminium-alloy double-skinned construction
Traction Control
GTO-VVVF (Siemens AG)
IGBT-VVVF (Toshiba PMSM) (2017)
Line Voltage
750V DC (nominal) from third rail
Standard gauge (1435mm)
Maximum Speed
90km/h (design)
80km/h (service)
Train Length
138m (6 cars)
Car Length
23.65m (DT)
22.80m (M1/M2)
Train Weight
214t (tare condition/unladen)
323t (fully laden)
1.45m wide, 8 per car
Seating Capacity
372 seats (unmodified)