Circle Line

The Circle Line is the fourth line to be introduced into the MRT system and is coloured orange on the system map. SMRT is currently operating this line.

Designed as a medium-capacity orbital line, its purpose is to serve as a connection between major MRT lines, bypassing the city centre. The line was the world's longest fully underground and automated rapid transit line when it was completed in 2012.

It opened in five stages with an extension from 2009 and currently spans 35.7km across 30 stations. By 2025, the line will become a complete circle with three additional stations connecting HarbourFront to Marina Bay.

As with the North East Line, the Circle Line also features Art in Transit at all stations. The artwork of six stations, Dakota, MacPherson, Tai Seng, Bartley, Lorong Chuan and Marymount stations are selected through the Circle Line Art in Transit competition. Six interchange stations (with the existing lines) also feature Art Seats that were selected through the International Art Seats Design Competition at the Venice Biennale in 2006.


At a Glance

Circle Line

First opened 28 May 2009

35.7km with 30 stations

Medium capacity line with 3-car trains

Fully-automatic train operation

Line operated by SMRT Trains

Line diagram

Circle Line (CCL) Line Diagram

Stage 6: CC30 Keppel - CC32 Prince Edward Road stations are currently not in operation.

Rolling stock



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Initial plans

In the 1990s, the Circle Line then named the Marina Line, was planned as a 12-station line from Chinatown. Plans evolved to include the sector between Dhoby Ghaut to Stadium, and a part of the Marina Line from Chinatown to Promenade became part of the Downtown Line.

Constructions for the Circle Line began in 2003 and was originally scheduled to open progressively from 2006 till 2010. It was designed as an orbital line linking all existing MRT lines, allowing commuters to avoid the city centre when transferring between lines.

Kim Chuan Depot

Kim Chuan Depot (KCD), situated at Hougang Avenue 3 and Kim Chuan Road, is the world's first MRT depot built specifically for driverless trains. All train movement within this depot can be controlled centrally at the Depot Control Centre. The depot is 800m long and 160m wide and sits 17m below the surface. At 11 hectares, it is capable of stabling up to 77 three-car trains. The depot also provides cleaning and maintenance services for all the trains and systems of the Circle Line.

The depot is home to the Operation Control Centre that manages the trains running on the Circle Line, as well as the Depot Control Centre for KCD.

Nicoll Highway Collapse

The collapse of the Nicoll Highway on 20 April 2004 was due to the construction of the Circle Line tunnels near the Merdeka Bridge.

A part of the retaining wall could not handle the stress of holding the tunnel and gave way, which results in a 30m cave-in of the road above. As a result of the incident, three people were injured and four people passed away. They were:

  • Vadivil s/o Nadeson, a crane operator;
  • Liu Rong Quan, a construction worker;
  • John Tan Lock Yong, a Land Transport Authority engineer; and
  • Heng Yeow Peow, a foreman.

The highway was reconstructed and opened to traffic on 4 December 2004, while the new alignment of the Circle Line shifted Nicoll Highway station about 100m away from the original location. The station was reduced two-thirds of its original size and was subsequently opened on 17 April 2010 with the rest of the Circle Line stage 1 & 2 stations.

Stage 3

Due to the Nicoll Highway collapse in 2004, the opening of the line was delayed by a few years. Stage 3 of the Circle Line opened on 28 May 2009, running from Bartley to Marymount at a length of 5.7km.

Commuters from the North can conveniently travel to the North East and vice versa with the two interchanges to the North-South Line and North East Line at Bishan and Serangoon respectively.

Stage 1 & 2

The 5.4km Stage 1, from Dhoby Ghaut to Stadium, and the 5.6km Stage 2, from Mountbatten to Tai Seng, was subsequently opened on 17 April 2010.

It allows commuters to transfer to the East-West Line at Paya Lebar and provides convenient access to the Marina centre of Singapore.

Stage 4 & 5

The 9.8km stage 4 comprises seven stations from Caldecott to Kent Ridge, while the 6.8km stage 5 comprises five stations from Haw Par Villa to HarbourFront.

Stages 4 & 5 of the Circle Line opened on 8 October 2011, linking Buona Vista to Marymount and HarbourFront stations. It enables quick access to the West Coast areas and also serves as an alternative to Jurong East when transferring between the North-South Line and East-West Line.

Line extensions

Circle Line Extension

The 2.4km extension to the Circle Line opened on 14 January 2012, extending off Promenade to Marina Bay station. The extension was opened to anticipate the opening of the new Marina Bay Integrated Resort at Bayfront.

Stage 6

The 3-station 4km Circle Line Stage 6 will complete the loop of the Circle Line, connecting HarbourFront to Marina Bay stations. The sixth stage was initially slated to be completed by 2025. It was announced in the Ministry of Transport Committee of Supply Debate 2021 on 5 March 2021 that the opening date for the Circle Line Stage 6 will be pushed back by a year to 2026 due to the COVID-19 pandemic.

To cope with the additional ridership in the future, the Circle Line Kim Chuan Depot also be expanded to double its capacity from 70 to 133 trains.


Date Project Description
28 May 2009 Stage 3 Bartley - Marymount (5 stations)
17 April 2010 Stage 1 & 2 Bartley - Dhoby Ghaut (11 stations)
8 October 2011 Stage 4 & 5 Marymount - HarbourFront (12 stations)
14 January 2012 Circle Line Extension Promenade - Marina Bay (2 stations)
2026 Stage 6 HarbourFront - Marina Bay (3 stations)
Future Future stations between existing stations Bukit Brown station between Caldecott and Botanic Gardens

Facts + Figures

Medium capacity Mass Rapid Transit (MRT)
Stations / Length
30 stations / 35.7km (currently operational)
Dhoby Ghaut to HarbourFront - 33.3km
Circle Line Extension - 2 stations / 2.4km
Stage 6 (future) - 3 stations / 4.0km
Kim Chuan Depot
Train Length
3 cars
Track Gauge
Standard gauge (1435mm)
750V DC from third rail
Operation Type
Fully-automated operation
Signalling System
Moving-block Alstom Urbalis 300 CBTC