Asia – Downtown Line 2 Extension (DTL2e) Tunnels, Singapore
Client / Awarding Authority
Land Transport Authority (LTA), Singapore
Winning Contractor(s)
China Railway Tunnel Group Co. Ltd. (Singapore Branch), Singapore / China
Project Scope
Design and construction of twin bored running tunnels forming part of the Downtown Line 2 Extension (DTL2e), connecting the existing Bukit Panjang station to the future DE1 station.
Works include tunnelling beneath Woodlands Road and major existing infrastructure, including the Kranji Expressway (KJE) flyover, within a constrained urban environment adjacent to operational railway assets.
The scope also requires coordination with the Downtown Line operator (SBS Transit) and relevant authorities, with critical activities scheduled during non-operational hours. Real-time monitoring of ground movement and structural behaviour will be implemented, alongside safety measures to protect existing infrastructure.
Tunnel Characteristics
- Type: Twin bored rail tunnels
- Length: Approximately 2 × 1.8 km
- Alignment: Beneath Woodlands Road and KJE flyover
- Key features:
- Construction in close proximity to live rail infrastructure
- Limited working space near Bukit Panjang station
- Real-time ground and structural monitoring systems
- Staged construction to minimise operational disruption
Contract Value
Approximately S$199 million (≈ £117 million)
Duration
Construction scheduled to commence Q3 2026; overall DTL2e operations targeted for 2035
Location
Singapore, between Bukit Panjang and Sungei Kadut (north-west region)
For further information please see the Tunnelbuilder archive and visit:
https://www.lta.gov.sg/content/ltagov/en/newsroom/2026/3/news-releases/lta-awards-final-civil-contract-for-the-downtown-line-2-extensio.html 11/26
