The North–South Line (NSL) is a high-capacity Mass Rapid Transit (MRT) line in Singapore. Operated by SMRT Corporation, it is coloured red on the rail map and long. It serves 27 stations, 11 of which, between Braddell and Marina South Pier, are underground. The line runs from Jurong East station in the west of the country to Marina South Pier in the city-centre via Woodlands station in the north. It operates for almost 20 hours a day (from approximately 5am to 1am the next day), with headways of 1 to 2 minutes during peak hours and 5 to 6 minutes during off-peak hours. All trains on the NSL run with a six-car formation.
Commenced on 22 October 1983, the NSL was the first MRT line to be built in Singapore. The inaugural section from Yio Chu Kang station to Toa Payoh began service on 7 November 1987, followed by a southwards extension to Raffles Place station on 12 December that same year and one northwards to Yishun station on 20 December 1988. After the southern extension to Marina Bay station opened on 4 November 1989, the NSL was formed and split from the East–West Line (EWL). During the 1990s, the Branch Line, which ran from Jurong East to Choa Chu Kang, was extended northwards towards Woodlands, before turning south to Yishun where it became part of the NSL.
With the NSL's status as the oldest and heavily utilised MRT line and its ageing infrastructure, significant improvements have been made to it since the 2010s. They include the replacement of sleepers, third rail and the introduction of new rolling stocks, the C151B, C151C and R151, which gradually supersede the older rolling stocks and increasing passenger capacity. Other recent developments of the line include a new extension to Marina South Pier station on 23 November 2014 and a new infill station, Canberra station, on 2 November 2019. The NSL is also the first line to have undergone a major re-signalling project, converting it from semi-automatic to fully automated operations in 2019. Two more infill stations, Brickland and Sungei Kadut stations, are under planning and set to open in the 2030s.
History Initial developments
The Mass Rapid Transit (MRT) originated from a forecast in 1967 by the planners of the State and City Planning Project, which stated the need for a rail-based urban transport system in Singapore by 1992. Following a debate on whether a bus-only system would be more cost-effective, then-Minister for Communications Ong Teng Cheong came to the conclusion that an all-bus system would be inadequate, as it would have to compete for road space in the land-scarce country.
After deciding on a rail-based system, the construction of Phase I of the MRT system, which will be the North–South Line, was given priority as the line passes through areas having a higher demand for public transport, such as the densely populated housing estates of Toa Payoh and Ang Mo Kio and the Central Area. The line was expected to relieve the traffic congestion on the Thomson–Sembawang road corridor. Construction of the MRT line (and also the MRT system itself) started on 22 October 1983, and the first section from Yio Chu Kang station to Toa Payoh station opened on 7 November 1987. At the inauguration ceremony, Ong Teng Cheong, who backed and commissioned the planning of the MRT system, attended the ceremony as a special Guest of Honour. Dr Yeo Ning Hong, the Minister For Communications and Information, inaugurated the start of MRT operations and announced it to be the "beginning" of the MRT system.
Nine more stations from Novena station to Outram Park station via Raffles Place opened on 12 December that year. The line was extended northward to Yishun station on 20 December 1988 as part of phase 2B and it began independent operations on 4 November 1989 as the North–South Line when the extension to Marina Bay station was opened.
Woodlands extension
After the Branch Line opened in 1990, the Woodlands MRT line was envisioned so as to close the gap between Yishun and Choa Chu Kang stations. Numerous changes were made to the number of stations for the extension mainly to accommodate the 1991 Concept Plan by the Urban Redevelopment Authority, which aimed to make Woodlands a regional centre for northern Singapore.
During the initial planning of the line, Sembawang station was only intended as a provisional station, to be built at a later date due to the underdevelopment of Sembawang, and construction began on 19 November 1992. Sembawang station and Kranji station were later included in the construction after the second round of planning (construction began at the same time on 19 November 1992) and Sungei Kadut station was then omitted. Sungei Kadut will be built later if the town's population justifies the necessity for the station.
During the construction, a total of 19 new trains were purchased for almost S$259 million for the new MRT line, designed by German company Siemens Aktiengesellschaft, to complement the 66 first-generation C151 trains. There was also a need to level the land covered in thick vegetation in Kadut, Woodlands and Sembawang for the MRT line.
With the official opening of the Woodlands extension on 10 February 1996 by then Prime Minister Goh Chok Tong, the Branch Line was incorporated into the North–South Line. The extension was built at a cost of $1.2 billion.
Subsequent developments
The NSL platforms of the Bishan station underwent major alterations to increase the passenger capacity of the station from 1,250 to 2,020. A new air-conditioned platform to serve southbound trains then to Marina Bay was constructed and opened for service on 27 July 2008, connected to Junction 8 via Exit E. The station was expanded to handle increased passenger traffic when the CCL station opens. As the original platform, now serving northbound trains to Jurong East, remained in service, upgrading works for the platform (Platform A) was hindered and took about a year to complete. While the re-tiling of the platform was done during the day, the Platform Screen Doors (PSDs) were installed in sections through the night. An air-conditioning system was also installed as part of the upgrade. Upgrading works for the platform were fully completed on 23 May 2009.
Under the Land Transport Master Plan 2008, the Jurong East Modification Project entailed the construction of a new platform and the addition of a fourth track to Jurong East station to reduce waiting times and crowding at the station during peak hours. The modification project was completed on 27 May 2011. The track and platform was initially opened during morning peak hours only, but since December 2011, they also operate during the evening peak hours.
In the 2008 Land Transport Master Plan, the North–South Line extension was announced as one of the upcoming projects rolled out by the Land Transport Authority to expand Singapore's rail network. The one-kilometre extension from Marina Bay to Marina South Pier station was opened on 23 November 2014. This extension serves the Marina South Pier, the Marina Bay Cruise Centre Singapore, and future developments in the Marina Bay Downtown area.
On 17 January 2013, the Land Transport Authority (LTA) announced that a feasibility study was conducted to construct Canberra MRT station. The feasibility study was completed in 2014 and LTA announced Canberra as a new station. Construction of Canberra station commenced on 26 March 2016. The station, which is an infill station with side platforms, was built along an operational section of the line between Sembawang and Yishun. The station cost S$90 million to build, and is meant to serve upcoming developments at the vicinity. Canberra station opened on 2 November 2019.
In 2025, the LTA announced that 40 stations on the North–South and East–West lines will gain public artworks, as part of expansion of the Art in Transit programme.
Incidents On 3 March 2003, a 23-year-old man lost control of his vehicle along Lentor Avenue, crashed through the fence, and landed on a stretch of track between Yio Chu Kang and Khatib stations. The incident forced a train carrying hundreds of commuters to come to a screeching halt, but not before flattening the front of the car. The accident disrupted train services for more than three hours and cost SMRT between S$100,000 and $150,000 in damages and lost revenue.
On 15 December 2011, train services between Bishan and Marina Bay stations were disrupted due to damage sustained on the power rail between City Hall and Dhoby Ghaut. Trains along this stretch were stalled and caused a service disruption until 11:40pm on that day. Two days later, a similar problem caused a seven-hour disruption between Ang Mo Kio and Marina Bay. According to SMRT, the disruption was caused by damage to the third rail and the trains' collector shoes. Seven trains were damaged in this incident. These two service disruptions on the North–South line were both related to damaged rail, and became one of the worst disruption since SMRT's inception in 1987.
On 7 July 2015, train services on the North–South and East–West lines were temporarily disrupted due to massive power trips detected along both lines. A cause of the disruption was due to damaged insulators which caused a failure to properly supply power. For this disruption that brought inconvenience to 413,000 commuters, LTA imposed a 'record' fine of S$5.4 million on SMRT.
On 7 October 2017, a 20-hour long disruption started due to flooding in the tunnels between Braddell station and Bishan station due to a faulty drainage system, resulting in disruption of train services between Ang Mo Kio and Marina South Pier stations in both directions for several hours. A trackside fire between Raffles Place and Marina Bay stations further exacerbated the disruption. Train services between Marina South Pier and Newton resumed at about 9:20pm on the same day, followed by Newton and Ang Mo Kio at around 2pm the following day. Although no injuries or casualties were reported from the incident, SMRT fired a total of eight employees from the maintenance crew and incurred a S$2 million fine.
On 14 October 2020, train services from Jurong East to Woodlands stations were disrupted for more than three and a half hours, owing to a faulty power cable, which affected the East–West Line and Circle Line too. The power fault began at 7pm and by 7:30pm, commuters were stuck in the trains. Free bus bridging services were activated at all affected stations, and bus operators increased the frequency of regular services serving these areas. Service resumed at all stations along the North–South and East–West Lines at 10:35pm. A total of 36 stations were affected by the power fault. The incident led to a replacement of 150km of power cables for the Tuas West Extension and two SMRT staff being suspended.
On 27 October 2023, trains skipped Novena MRT station for about 2 hours during the evening travel peak, after an air-conditioning unit filled the underground station with smoke. Free bus bridging services were provided between Newton MRT station and Toa Payoh MRT station, and ended shortly after the station was reopened at around 7:30pm.
On 3 June 2024, around 5.50pm, a lightning strike caused traction power to trip, as well as a small fire breaking out in a power control box next to the train track located about 20 metres from the platform of Kranji MRT station. No injuries were reported. This resulted in train services to be suspended between Choa Chu Kang and Woodlands stations for more than two hours. According to the Singapore Civil Defence Force, the fire had burned itself out before its officers arrived. Train services were progressively restored at 8.10pm.
Future plans