Thomson–East Coast MRT line

The Thomson–East Coast Line (TEL) is a medium-capacity Mass Rapid Transit (MRT) line in Singapore. Coloured brown on the rail map, it is fully underground. When fully completed, the sixth line on the country's MRT network will serve 32 stations around 43 kilometres (27 mi) in length, becoming one of the world's longest driverless rapid transit lines. It runs along a combined north–south and east–west corridor, starting in the north at Woodlands town, passing through Upper Thomson and the towns of Ang Mo Kio and Bishan, heading south to the city-centre at Orchard Road and Marina Bay, subsequently heading eastwards along the eastern coast of the country through Kallang, Marine Parade and southern Bedok before ending at Upper East Coast.

The line was first announced by the Land Transport Authority (LTA) on 15 August 2014, merging the previously planned and distinct Thomson (TSL) and Eastern Region (ERL) lines. By then, construction of the TSL had already begun in January 2014. The line is being opened in stages, beginning with Stage 1 on 31 January 2020. Stage 2 opened on 28 August 2021 and Stage 3 opened on 13 November 2022. Stage 4 opened on 23 June 2024 while Stage 5 is scheduled to open from the second half of 2026. Meanwhile, Mount Pleasant and Marina South stations, which were structurally completed as part of Stage 3, remain non-operational due to the perceived lack of developments in the area at this given time.

In January 2019, an infill station known as Founders' Memorial was announced to complement its namesake, with the LTA additionally considering to integrate the Changi Airport Branch that is currently a part of the East West Line (EWL) into the TEL. When fully opened, it is expected to serve about 500,000 commuters daily in the initial years before rising to one million in the long-term. It is the fourth MRT line to be operated by SMRT Trains Ltd and also the fourth to be completely automated and driverless. The line is currently served by Mandai Depot, with the East Coast Integrated Depot opening in the second half of 2026, and services are operated by the T251 electric multiple unit (EMU) rolling stock manufuactured by Kawasaki–CRRC.

New and improved signage was introduced to alI stations along the TEL, which saw less text and wordiness, and more illustrations and visualisations. Moreover, ever since the TEL began operations, all the other MRT lines on the wider network have since been represented by their initials. In addition, the exits are represented numerically rather than alphabetically.