North–South MRT line

The North–South Line (NSL) is a high-capacity Mass Rapid Transit (MRT) line in Singapore, operated by SMRT Corporation. Coloured red on the Singapore rail map, the line is 45 kilometres (28 mi) long and serves 27 stations, 11 of which, between the Braddell and Marina South Pier stations, are underground. It runs from Jurong East station, located in Western Singapore, to Marina South Pier station in the Central Area, via Woodlands station in northern Singapore. The line 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 the trains on the North–South Line run with a six-car formation.

It was the first MRT line to be built in Singapore, with the first section from Yio Chu Kang station to Toa Payoh station beginning service on 7 November 1987, followed by an extension southwards to Raffles Place station on 12 December the same year and northwards to Yishun station on 20 December 1988. After the southern extension to Marina Bay station opened on 4 November 1989, the North–South Line was formed and split from the East–West Line. In the 1990s, the line extended to the north and west connecting to the Branch line via Woodlands through the Woodlands line extension.

Since the 2010s, due to the ageing infrastructure of the North–South Line (being the oldest and heavily utilised MRT line), significant improvements have been made on this line, such as the replacement of sleepers, third rail replacement and the introduction of new rolling stocks (the C151B, C151C and R151) to replace the older rolling stocks and increase passenger capacity. The North–South Line is also the first line to have undergone a major re-signalling project, converting it from semi-automatic to fully automated operations in 2019. 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. Two more infill stations (Brickland and Sungei Kadut stations) on the line are being planned and are set to be opened in the 2030s.