CR106 - Completion of WB tunnel

We have just learnt that tunneling works for contract CR106, responsible for the construction of Loyang station and connecting tunnels to Pasir Ris East station, have been completed. The westbound (WB) tunnel boring machine (TBM) successfully docked with the Loyang station box earlier this month. This follows the earlier docking of the eastbound (EB) TBM in January this year. With the latest completion, approximately 16 of the 29 tunnel drives for phase 1 have now been completed.

CR106 - Completion of eastbound tunnel

 

Another tunnel that has recently been completed along the Cross Island Line's (CRL) phase 1 section is the eastbound tunnel under contract CR106. This contract will be responsible for the construction of Loyang station and tunnels connecting to neighbouring Pasir Ris East station. Two tunnel boring machines (TBMs) are being used for the construction of the tunnels, with the launch shaft constructed under contract CR107, next to the Pasir Ris East station before being handed over to contract CR106.

Tunnel updates - CR106, CR109, CR111, CR112 & CR116

CRL1 tunnel chart as of end-2025, to the team's best knowledge.

Tunneling works along the Cross Island Line (CRL)'s phase 1 have been progressing well, thanks to the favourable soil conditions in the eastern side of the island. Soil here is typically composed of old alluvium, great for tunneling as seen through the quick work made of tunnels under several contracts of late. 

August 2023 - A view of the displays within the CRL1 Project Information Centre. The display
on the left shows the Soil Profile along the CRL1.

A screenshot of the Soil Profile along CRL1.
Source: CRL1 Virtual PIC

Old Alluvium is a dense and strong material, capable of supporting the surroundings while tunneling work is being carried out. While strong, it is also easier to tunnel through than Bukit Timah Granite, an extremely hard rock that dominates the soil profile of Western Singapore. The transition from Old Alluvium to Bukit Timah Granite takes place in the vicinity of Ang Mo Kio and Teck Ghee.

With the favourable Old Alluvium in Eastern Singapore, here are some updates on tunneling work across CRL1.

• Contract CR106 - The second tunnel boring machine (TBM) has passed under housing blocks and is in the vicinity of Loyang Avenue.
• Contract CR109 - The westbound TBM has completed its second & final drive. Eastbound TBM was boring underneath Tampines Road in the vicinity of Tampines Dormitory.
• Contract CR111 - Both TBMs have completed their drives towards Hougang station.
• Contract CR112 - According to the Land Transport Authority (LTA), both TBMs have completed their drives toward Serangoon North station.
• Contract CR116 - As of end-November, the TBM's second drive was 63% completed.

CR106 - Loyang Q1 2023 update

 

30 March 2023

Under contract CR106, a section of Loyang Avenue between Pasir Ris Drive 3 and Loyang Way was closed on 26 February 2023 to facilitate the construction of Loyang Cross Island Line (CRL) station and a vehicular viaduct on top. Since the closure in late February 2023, the work site has been cleared of trees and heavy equipment had moved in.

CRL1 Video directory

 

Yesterday, the Land Transport Authority (LTA) released a video showing a flythrough of the upcoming Tampines North station along the Cross Island Line (CRL) phase 1. LTA has been noticeably more active in uploading videos of & marketing the CRL across its social media channels. In addition to the new video on Tampines North, they also uploaded another video on the Rectangular Tunnel Boring Machine (RTBM) being used at the Teck Ghee station under contract N109A to construct subways to two exits located within Bishan-Ang Mo Kio park.

CR106 - Reminder on closure of Loyang Avenue

 

Infographic on Loyang Avenue closure.
Source: LTA

Infographic on Loyang Avenue closure.
Source: LTA

The 26th of February is fast approaching and along with it, the closure of a section of Loyang Avenue to facilitate construction works for the Cross Island Line (CRL) and Loyang Viaduct projects. Ahead of the road closure, the SgMC team visited the site a few weeks back to capture some shots of the area before the change takes effect.

CR106 - Loyang 2022 year-end update

 

27 December 2022

Over at Loyang, the site is slowly undergoing changes. One of the more obvious changes is the tree felling along a stretch of Loyang Avenue, outside the JTC industrial blocks. Soil investigation works are also taking place beyond the perimeter wall of the development. Apart from this, further up Loyang Avenue, works are underway to construct bus shelters along a part of the carriageway that will be closed and converted into a bus priority corridor for the duration of the station & Loyang Viaduct construction works.

CR106 - Before the road closure

03 October 2022 - A view of the northbound lanes of Loyang Avenue, next to the Loyang bus depot.

Thank you dear readers for putting up with the momentary hiatus over the last few weeks - some of us were involved in a family wedding of one of our siblings & the ensuing family reunion over in Kuala Lumpur, Malaysia. We're now back to our regular reporting and with the recent road closure that took place along Pasir Ris Drive 1 yesterday, are back with more images to capture how things look before a further road closure along Loyang Avenue to facilitate the construction of the Cross Island Line (CRL) station under contract CR106 as well as the upcoming Loyang Viaduct.

CRL1 - Detailed station location maps

During the ministerial visit and announcement at Bright Hill station for Cross Island Line stage 1 (CRL1) this morning, there were no exhibits showing the detailed station location maps for each of the 12 stations along the announced section. Additionally, the Land Transport Authority does not appear to have released such maps either. Instead, we have noted various Members of Parliament have been posting these on their social media platforms. Do have a look at some of the more detailed station location plans we've found and we will continually update on any new maps as we come across them.

Edit @ 1634pm - Defu, Serangoon North & Tavistock station location maps added.

Edit @ 0953am on 26 Jan 19 - Aviation Park, Hougang, Ang Mo Kio, Teck Ghee & Bright Hill station location maps added.

Aviation Park station location map.
Source: LTA

CRL1 announced

The Land Transport Authority announced the station locations for Cross Island Line stage 1 (CRL1) this morning at a site visit by Transport Minister Khaw Boon Wan to Bright Hill station. This will be the location of stage 1's western terminus.

Do stay tuned as the official press release becomes available later this afternoon.

Speculated station locations

After collating all the sightings of soil investigation works, we can finally compile a list of probable station locations for the Cross Island Line eastern (CRLe) section. Knowing that the line stretches from Changi to Bright Hill, here's our list of the speculated stations.

Speculated alignment of CRLe

Credit: y2koh

Soil Investigation: Loyang

The spread of boreholes in the Loyang area as noted on 1 July 2017 & updated with new rigs seen, as contributed
by Peter48.

A number of boreholes and soil investigation rigs were spotted along Loyang Avenue in 2017. These stretch from the intersection with Pasir Ris Drive 3 near the Loyang Bus depot all the way to the SIA Engineering compound. Some of the boreholes were noted to date back to 2016.

Update: New images thanks to contribution & permission from Peter48.