Cross Island Line

Connecting across the island

Enjoy faster travel from Changi to Jurong via key transport hubs on the Cross Island Line (CRL).

It will connect key employment areas such as Changi Logistics Park, Jurong Industrial Estate to residential estates such as Pasir Ris, Ang Mo Kio and Clementi.

When operational, it will have the highest number of interchange stations, with almost half the stations on the line being linked to existing rail stations. This means more alternative travel routes to get to your destination.

Constructed in three phases, the 29km long Phase 1 of the CRL (CRL1) will comprise 12 stations from Aviation Park to Bright Hill. This will serve residential and industrial areas such as Loyang, Tampines, Pasir Ris, Defu, Hougang, Serangoon North and Ang Mo Kio. More than 100,000 households will benefit from CRL1, and common recreational spaces such as Changi Beach Park and Bishan-Ang Mo Kio Park will also become accessible by public transport. Construction for CRL1 is expected to commence in 2020 and be completed by 2029.

Alignment Options for CRL

The Government is currently studying two underground alignments in the vicinity of Central Catchment Nature Reserve (CCNR) to decide on the option that best serves the public. No decision has been made on the alignment option. 

To allow an informed decision on the final alignment for the CRL, LTA commissioned in 2014 an Environmental Impact Assessment (EIA) for both alignment options which consists of a robust two-phase EIA process for the two alignment options.

alignment options

Details of the Direct (Blue) and Skirting (Pink) Alignment Options and Surface Worksites Outside CCNR

direct alignment option
  • 2km tunnel beneath the CCNR, 2km outside it
  • Approximately 70m deep or the height of a 25-storeys HDB flat
  • Tunneling will be done fully in hard granite rock
  • No physical structure on the surface level within the CCNR
  • Travelling time: approximately 5 minutes (from Bright Hill to the next station)
skirting alignment option
  • Does not cross under the CCNR, skirts around (and away) from CCNR
  • Approximately 45m deep to ensure that tunneling will be safe for buildings and away from existing underground infrastructure along this alignment
  • 9km tunnel route length under roads as well as residential and commercial buildings
  • Travelling time: approximately 11 minutes (from Bright Hill to the same next station)
Two-phase EIA Process

Phase 1 evaluated the existing ecosystem and physical conditions of the CCNR as well as the environmental impact of site investigation (SI) works within the CCNR.  Phase 1 had been completed with the report gazetted and published on the LTA website in 2016.  The findings of the SI works (carried out following the report) were used to inform Phase 2 of the EIA.

Phase 2 zoomed into the potential environmental impact of the construction and operations of the CRL as well as the required mitigation measures.  LTA sought inputs from, and engaged with, the relevant stakeholders as part of this process.  This phase of the EIA has recently been completed and a comprehensive report on its findings was published. Extensive consultations are being held to consider all views and issues, including the environmental impact, length of commute, engineering feasibility, disruptions to businesses and families, as well as the cost to taxpayers. 

Figure 7_small
EIA Phase 2 Report for Cross Island Line CCNR Alignment Options

Engineering Schemes 

LTA have devised robust engineering schemes for the two alignments.  These schemes define the geographical focus and construction techniques to be adopted that informed the EIA.  The engineering schemes are robust and independently reviewed by LTA’s International Panel of Advisors (IPA)[1].  The IPA comprises internationally renowned experts in geotechnical and tunnel engineering, who concluded that with control measures in place, tunnelling along either alignment option is safe.

The EIA, by Environmental Resource Management (S) Pte Ltd (ERM), was rigorously undertaken based on an internationally-recognised framework and relevant authoritative references[2].  ERM is a global specialist in environmental, social, health, safety and risk management consulting services that have done similar EIA works in the UK, China and Hong Kong.  The EIA Report, too, was independently reviewed by an appointed consultant[3].

engineering schemes
Gazette of the EIA (Phase 2) Report

LTA gazetted the EIA Phase 2 report on 2 September 2019 and made it available for public views for one month from the gazette date. We thank the public for your feedback, and will incorporate all relevant feedback into the EIA Report.  

No decision on the alignment option has been made.  The decision on the final alignment will eventually be made by the Government based on factors such as connectivity, travel times, costs as well as impact on home owners and the environment.

Key points of Phase 2 EIA Report
summary of key points of Phase 2 EIA report
No. of stations icon

Number of stations

Length of rail line icon

Length of line

Expected project completion icon

Expected completion

[1] The members to the IPA are appointed on a two-yearly basis by LTA. For the 2017-2019 term, the IPA was chaired by Prof Yong Kwet Yew (Singapore), NUS Senior Vice President and Professor of Civil Engineering, whilst the other IPA members included Mr John Busbridge from Canada, Ex-President Golder Associates on Global Operations; Mr Eddie Woods from the United Kingdom, Tunnel Discipline Lead for UK High Speed 2 and ex-Chief Engineer Thames Tideway Tunnel; Prof Lee In-Mo from Korea University, Director of Institute of Underground Space Technology and ex-President of International Tunnelling Association; Mr Tadashi Hashimoto from the Director of Geo-Research Institute in Japan and Overseas Expert of Science and Technology committee to Shanghai Municipal Commission.

[2] The biodiversity assessment for the CRL Phase 2 EIA Report took into account the international standards set out in the International Finance Corporation (IFC) Performance Standard/Biodiversity Offsets and accompanying materials.

[3] Mr. Tony O'Dempsey has been engaged by LTA as the independent reviewer for the EIA (Phase 2) Report. He was also the independent environmental consultant in Phase 1 site investigation works inside the CCNR. Tony has been working as a volunteer on various conservation projects relating to the Nature Reserves for the past 20 years and is very familiar with the forest habitats of the CCNR. An active member in the Nature Society of Singapore (NSS), he has held various positions in the past, including council member of NSS and chair of its vertebrate study group. He is a professional who has been working in the Geographic Information System (GIS) industry in Singapore for 25 years and has applied his GIS and cartography skills to the various conservation projects he has worked on.  He has a Bachelor Applied Science (Surveying) from Queensland University of Technology. 

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