Cross Island Line Construction: CRL - A snapshot in May 2025

An overview of CRL1 contracts CR101 - CR111 as of May 2025.
Top (L - R) : CR101 - Changi East Depot, CR102 - Tunnels, CR103 - Aviation Park station
Middle (L - R) : CR106 - Loyang station, CR107 - Pasir Ris East station, CR108 - Pasir Ris station
Bottom (L - R) : CR109 - Tampines North station, CR110 - Large bored tunnel, CR111 - Defu station

An overview of CRL1 contracts CR112 - CR117, CPE contracts P102 & P103 and CRL2 contract CR202 as of May 2025.
Top (L - R) : CR112 - Hougang station, CR113 - Serangoon North station, CR115 - Tavistock station
Middle (L - R) : CR116 - Ang Mo Kio station, N109A - Teck Ghee station, CR117 - Bright Hill station
Bottom (L - R) : P102 - Elias station, P103 - Cripple siding, CR202 - Large bored tunnel

An overview of CRL2 contracts CR205 - CR211 as of May 2025.
Top (L - R) : CR205 - King Albert Park station, CR206 - Maju station
Middle (L - R) : CR207 - Tunnels, CR208 - Clementi station, CR209 - West Coast station
Bottom (L - R) : CR210 - Tunnels, CR211 - Jurong Lake District station

It has been a while since we've done a snapshot feature of the Cross Island Line (CRL), with our last being done in February for the Punggol Extension. Part of this stems for the works being "less noticeable", since the majority of this takes place underground and relatively out of sight. Another part is that it also appears that updates on the CRL aren't as popular compared to updates on other lines (granted, the above ground line updates are A LOT more interesting as you actually see things change with most monthly updates). Nonetheless, we thought it's time to see where the CRL is in progress with this rather comprehensive mid-year update.

Phase 1
Several milestones were hit this past month, including the completion of several tunnels for the line. As not much fanfare was made about the accomplishment, we're still trying to verify facts and not make assumptions on the progress of tunneling works - hence do bear with us if some of the updates are slightly slow. Tunneling works are now in progress for 10 of the 11 contracts with such works - the remaining contract being CR108 at Pasir Ris.

Tunneling chart, to the best of the team's knowledge, as of May 2025 for CRL1.

Changi East Depot (Contract CR101)
In a nutshell: The structures of the stabling sheds were pushing ahead with the roof frames being assembled and roofing added in. Other components of the depot were also in various stages of structural progress - the administration building which will house the Operations Control Centre for the line & workshops. The administration building can be seen as a concrete structure coming up behind the stabling sheds while the workshops are not as far along as compared to the stabling sheds.

19 May 2025

Tunnels between CED & AVP stations (Contract CR102)
In a nutshell: The first of five tunnels to be constructed was completed - for reception track 3 which connects the Changi East Depot to the CRL Facility Building 1 (FB1). This TBM will be reused for a subsequent drive towards Aviation Park station. 4 tunnels remain to be constructed.

13 May 2025
Image from LinkedIn

CR2 – Aviation Park (Contract CR103)
In a nutshell: Excavation for the station box was ongoing.

19 May 2025

CR3 - Loyang (Contract CR106)
In a nutshell: The launch shaft was handed over to Woh Hup-Dongah Joint Venture. Since then, tunneling work for the eastbound tunnel appears to have commenced. Sections of the TBM back up gantries were seen on site along with tunnel ring segments.

29 May 2025

CR4 - Pasir Ris East (Contract CR107)
In a nutshell: Diaphragm wall construction was ongoing at the station site while king posts were being inserted to support future excavation works at the station.

29 May 2025

CR5 | CP1 - Pasir Ris (Contract CR108)
In a nutshell: Hacking works were taking place within the contract's launch shaft at the eastern end of the work site. Diaphragm wall works continued as road realignment preparation works were taking place. In a recent virtual town hall session, diaphragm wall works are expected to continue up to mid-2026. Tunneling works are expected to commence in Q4 2025.

29 May 2025

CR6 - Tampines North (Contract CR109)
In a nutshell: One of the gantry cranes has since been relocated from the northern launch shaft to the southern shaft. A large crane was on site at the southern launch shaft while an excavator removed muck from the mucking pit into a steady stream of waiting tipper trucks. It can be inferred that construction of at least one tunnel connecting the station to Pasir Ris has been completed and the Tunnel Boring Machine (TBM) since redeployed for the run towards FB3 being constructed under contract CR110.

29 May 2025

Large diameter bored tunnels – Paya Lebar Air Base (Contract CR110)
In a nutshell: The large crawler crane that was employed for the lowering of the TBM components into the launch shaft at the site of FB3 has since been decommissioned and removed from site. Tunneling works are likely to have commenced on the single drive towards Defu station, as the gantry crane was observed moving tunnel ring segments. The muck removal system employed for this TBM uses conveyor belts for the continuous removal of muck, as opposed to work trains with muck cars for the TBMs of smaller diameters.

29 May 2025

19 May 2025

CR7 - Defu (Contract CR111)
In a nutshell: Tunneling works appear to be focused on the westbound tunnel that TBM Daphne is constructing, with both gantry cranes busy supporting the tunneling operations. The surface watchman post, denoted by the multi-colour umbrella serves as an indicator of the TBM's location - potentially indicative that TBM Daphne has completed the initial drive and is preparing to convert into the main drive stage of tunnel boring. Further along the site, it appears that diaphragm wall excavation works have been completed due to the absence of hydrofraise and clamshell grabber machines on site.

29 May 2025

CR8 - Hougang (Contract CR112)
In a nutshell: Hoarding within the station for the construction of a temporary platform lift had been completed. Additional hoarding within the concourse fare unpaid area was also set up to facilitate addition & alteration works within the station. At street level, construction works for the third phase of diaphragm walls continued following the road diversions enacted in end-March.

25 May 2025

29 May 2025

CR9 - Serangoon North (Contract CR113)
In a nutshell: Owing to the station's length, diaphragm wall construction works were underway at various sites along the project's work areas. Excavation works were in progress in the vicinity of Exit 3 as well, while such works appear to have been completed at the site of Exit 4 where pipe jacking works will take place.

31 May 2025

25 May 2025

CR10 - Tavistock (Contract CR115)
In a nutshell: Following several road layout changes, demolition of a pedestrian overhead bridge and relocation of pedestrian crossings, diaphragm wall works were now taking place in the centre median of Ang Mo Kio Avenue 3. A mobile crane was also recently seen at the site of the intermediate launch shaft at Teck Ghee Park, possibly indicating that the third TBM might have been recently lowered into the shaft.

31 May 2025

25 May 2025

CR11 - Ang Mo Kio (Contract CR116)
In a nutshell: Diaphragm wall works had since shifted to the northern edge of the station, with Ang Mo Kio Avenue 3 being shifted southwards to make room for the construction works. The contract's TBM was also recently launched from the intermediate launch shaft, located at the junctions of Ang Mo Kio Avenues 3 and 6.

31 May 2025

Video from LinkedIn

CR12 – Teck Ghee (Contract N109A)
In a nutshell: Since the completion of the subway constructed by the rectangular TBM at Exit 3, the machine has been redeployed to the site of Exit 2 to repeat the process for a shorter underpass. Structural works continued underneath Ang Mo Kio Avenue 6 for the expressway tunnels and rail station.

31 May 2025

CR13 – Bright Hill (Contract CR117)
In a nutshell: Bored piling works continued along the length of the worksite at the interchange station. Bored piles typically would take longer to construct for a wall of similar length than diaphragm walls which are constructed panel by panel. It is likely that the stronger rock encountered in the area necessitated the use of bored piles as opposed to diaphragm walls. Tunneling works appear to have commenced recently, with the surface watchmen post marking the location of the TBM underground.

31 May 2025

Punggol Extension
Works along this stretch are still at an early stage as compared to phase 1 of the line. As such, earth retaining & stablising structure (ERSS) construction is ongoing and excavation works have not commenced in earnest. The project will employ the use of 2 TBMs, both of which have since been delivered.

Tunneling chart, to the best of the team's knowledge, as of May 2025 for CPE.

CP2 – Elias (Contract P102)
In a nutshell: Construction of the diaphragm walls for the launch shaft had been completed and excavation works progressed. Hacking and mining of the adit through which the TBM will begin its drive were potentially underway within the peanut-shaped shaft. TBM components had since been delivered to site, although no gantry cranes were set up in the vicinity of the launch shaft yet. Elsewhere along the station worksite, diaphragm wall construction was in progress.

29 May 2025

Cripple siding & launch shaft (Contract P103)
In a nutshell: Tunneling works appear to be underway with the construction of a noise enclosure above the launch shaft in use.

29 May 2025

Phase 2
As the most recently announced segment of the line, works here are at the least advanced stages among the contracts for the line, with one notable exception. Due to the length of the tunnel connecting this phase of the line to phase 1, the contract for the tunnel undercrossing the Central Catchment Nature Reserve was awarded early. This past month saw the launching of the TBM for this contract to begin tunneling works, the first for phase 2 of the line.

Tunneling chart, to the best of the team's knowledge, as of May 2025 for CRL2.

Tunnels connecting Turf City & Bright Hill stations (Contract CR202)
In a nutshell: This contract was the first phase 2 contract to be awarded. As such, it was the first phase 2 contract to commence tunnel construction with the launch of TBM Jane from the launch shaft south of the Pan Island Expressway, on the site of the former Bukit Timah Saddle Club.

9 May 2025
Image from LinkedIn

CR15 – King Albert Park (Contract CR205)
In a nutshell: Diaphragm wall construction works were in progress at the station site. Part of the worksite, taken from the compound of Casa Esperanza condominium, was being prepared for ERSS construction work with noise barriers being built and ground improvement works underway.

31 May 2025

CR16 – Maju (Contract CR206)
In a nutshell: At Maju station, ERSS works for the station to be sited underneath Clementi Road had also commenced. A replacement pedestrian overhead bridge (POB) had been launched across the main thoroughfare to enable construction works for the station to proceed. Soil investigation works were underway next to the Singapore Institute of Management bus stop for one of the station exits.

31 May 2025

Tunnels between Maju & Clementi stations (Contract CR207)
In a nutshell: Site clearing works were in progress for the launch shaft between Clementi & Maju stations, along Sunset Lane. Across Sungei Ulu Pandan, soil investigation works were underway where the tunnels would undercross existing HDB blocks.

31 May 2025

CR17 – Clementi (Contract CR208)
In a nutshell: Diaphragm wall construction works were in full swing for the northern end of the station, where ventilation buildings and exit structures would come up on the site of the former Police headquarters & neighbourhood police centre building. Community facilities such as the amphitheater and playground were also closed off, to be redeveloped as part of the station construction project. ERSS construction for the main station box had not yet commenced fully, as road diversions would likely necessitate the realignment of Clementi Avenue 4 further eastwards to enable such works.

Image from GoalFore Advisory

31 May 2025

CR18 – West Coast (Contract CR209)
In a nutshell: With Tanglin Secondary School since demolished, works were focused on construction of the station's ERSS walls. Several hydrofraise and clamshell grabber machines were on site to facilitate these works at two sites - one next to the Jamiyah Nursing Home and a second at the main station box site. The site next to the nursing home is especially important as it would likely double up as a launch shaft for tunneling works towards Clementi station.

31 May 2025

Tunnels between West Coast & Jurong Lake District stations (Contract CR210)
In a nutshell: Diaphragm wall construction works were launched early in the month for the launch shaft abutting the contract CR211 eastern cut & cover tunnel section. The shaft would enable tunnel boring machines to be launched towards West Coast station from here.

2 May 2025

31 May 2025

CR19 – Jurong Lake District (Contract CR211)
In a nutshell: Site clearing works were the main activity being carried out through the work site. This included a section near the junction of Science Centre Road and Jurong Town Hall Road, which would be used for the site office, some worker dormitories and other project offices for the CRL2. Within the station box site, some load testing and soil investigation works were underway as well.

31 May 2025

A similar but consolidated (a.k.a. simplified) post will be available on Instagram & Facebook on 14 June 2025.

Cross Island Line Construction

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Sunday, June 8, 2025

CRL - A snapshot in May 2025

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