Map showing the Thomson Rail Line, Singapore’s new rapid transit system. Image courtesy of Regional Transportation District (RTD).
Circle Line, North-South Line and Thomson underground rail tunnels will intersect at Marina Bay Station. Image courtesy of Regional Transportation District (RTD).
The Thomson line will feature six-car Type C151B metro train sets. Image courtesy of Regional Transportation District (RTD).

Thomson Line

The Thomson Line (TSL) is a new 30km underground mass rapid transit (MRT) system being developed by Land Transport Authority of Singapore. The new line will link the northern part of Singapore to the central business district (CBD) and Marina Bay area.

The line will comprise 22 stations and six interchange stations that will link with the metro lines from the existing network. The line is expected to benefit approximately 400,000 commuters and reduce travel times by half.

Ground-breaking ceremony for the project was held in June 2014 and full completion is expected by 2021.

Thomson Line details

The Thomson Line will benefit passengers living along the North South corridor, who are connected directly to the Marina Bay. The line will connect to the East-West Line, North-South Line, North-East Line, Circle Line, and the Downtown Line. It is also expected to link communities in Woodlands, Sin Ming, Thomson and Kim Seng to the CBD and to the rest of the island.

The new underground system will also feature interchange stations at Woodlands, Caldecott, Stevens, Orchard, Outram Park and Marina Bay.

"The line is expected to benefit approximately 400,000 commuters and reduce travel times by half."

The project is being developed in stages. The first stage includes the construction of three new stations and is expected to be completed in 2019. The second stage involving six stations will be completed in 2020 and the final stage, comprising 13 stations, is expected to come online in 2021.

The Thomson Line depot will be located at Mandai and will comprise an operation control centre, as well as a stabling and maintenance facility for the TSL trains. The line will intersect with Circle Line and the North-South Line at Marina Bay station.

Ground-freezing technology will be applied to prevent water seepage during tunnel construction at the Marina Bay station.

Rolling stock on the Thomson Line

The Thomson line will be operated with Type C151B six-car metro train sets, which are fully automated and driverless trains. The train sets will be the first in Singapore and will contain five doors on each side to facilitate smoother passenger boarding and alighting.

The trains will be operated from the 750V DC third rail power supply system present on the Thomson Line.

Signalling and communication system

Communication-based train control moving block technology will be used for the Thomson line. It will be supported by automatic train supervision system and computer-based interlocking technologies to enable automated driverless train operations.

The communications system will include a series of sub-systems, including the communications backbone network, digital trunked radio, video surveillance, public address, telephone and travel information system.

Contractors involved

Jurong Primewide was awarded the $329m contract to build the Mandai depot. The joint-venture of Tiong Seng and Geological Engineering was awarded the contract to construct the Great World station and its tunnels. Samsung C&T Corporation was engaged for the construction of Caldecott Station and its associated tunnels.

Hock Lian Seng Infrastructure was awarded a contract worth S$222m (approximately $177m) for the Maxwell station construction. China Railway No 5 Engineering Group was awarded the design and construction contract for the Lentor station and its associated tunnels.

The Mount Pleasant station and tunnels construction contract, worth S$207m (approximately $165.12m), was awarded to the joint-venture of RSEA Engineering, Eng Lee Engineering and Wai Fong Construction. Gammon Construction is responsible for the design and construction of the Mayflower station.

GS Engineering & Construction was contracted for S$292m for the construction of the Woodlands station and its associated tunnels. Woh Hup won a $144m contract for the construction of the Woodlands South station.

KTC Civil Engineering & Construction is responsible for the construction of the Orchard Boulevard station. Daewoo Engineering & Construction will build the Stevens Station and its associated tunnels under an S$441m (approximately $351.8m).

Shatin to Central Link (SCL) is a 17km-long railway line expansion undertaken by MTR Corporation in Kowloon and Hong Kong Island.

The consortium of GE Singapore/GE Transportation Systems/GE Transportation France/GE Transportation Systems was awarded an S$159m contract to provide the signalling system and platform screen doors. Singapore Technologies Electronics was engaged to provide communications system for the MRT.

Shanghai Tunnel Engineering was engaged for the construction of twin bored tunnels between Woodlands Station and Woodlands South Station.

Brown Consulting was awarded an A$14m contract for providing construction engineering and supervisory services for the Thomson line.

The consortium of Kawasaki Heavy Industries and CSR Qingdao Sifang was awarded the contract for providing locomotives for the Thomson Line. Kawasaki will look after the overall train design while CSR Qingdao Sifang will be responsible for the train body shell and the final assembly.