Project: Suburban Rail Loop East – Monash

Principal Contractor: CPB Contractors and ACCIONA

The Suburban Rail Loop East is Victoria’s largest transport infrastructure project, connecting Melbourne’s middle suburbs via a new 26-kilometre underground rail line from Cheltenham to Box Hill. The new Monash Station will be located at the corner of Normanby and Howleys Roads, delivered as part of the AU$3.6 billion tunnelling and station package by the Suburban Connect consortium of ACCIONA, CPB Contractors and Ghella. Early works to relocate utilities, modify road intersections and construct tunnel access structures were completed in 2025, with main works commencing in April 2026 to establish the construction site for station building and tunnel boring activities. Tunnel boring is expected to begin in early 2027, progressing north beneath Monash University’s Clayton campus, with the station serving the University, CSIRO, the Australian Synchrotron and the wider Monash Technology Precinct from 2035.

Key aspects of the project include:

• Construction of a new underground Suburban Rail Loop station at the corner of Normanby and Howleys Roads
• Relocation of underground utilities and construction of tunnel access structures ahead of main works
• Tunnel boring progressing north beneath Monash University’s Clayton campus from 2027
• Delivery by the Suburban Connect consortium of ACCIONA, CPB Contractors and Ghella

HCS is engaged on the project to provide Underground Service Locating services.

Project: Suburban Rail Loop East – Cheltenham

Principal Contractor: CPB Contractors and ACCIONA

The Suburban Rail Loop East is Victoria’s largest transport infrastructure project, connecting Melbourne’s middle suburbs via a new 26-kilometre underground rail line from Cheltenham to Box Hill. Cheltenham is the southern terminus of the SRL East tunnels, with works forming part of the AU$3.6 billion tunnelling and station package delivered by the Suburban Connect consortium of ACCIONA, CPB Contractors and Ghella. Crews at Cheltenham are relocating underground services and clearing the site of a former petrol station to prepare the ground for tunnelling and the new underground station, with tunnel boring machines launching from nearby Clarinda to build the tunnels through to Cheltenham. Cheltenham is also one of three southern stations, alongside Clayton and Monash, planned to connect passengers to the orbital rail network from 2035.

Key aspects of the project include:

• Relocation of underground services and site preparation ahead of tunnelling and station construction
• Remediation and clearing of a former petrol station site
• Construction of a new underground Suburban Rail Loop station at Cheltenham, the southern terminus of the SRL East tunnels
• Delivery by the Suburban Connect consortium of ACCIONA, CPB Contractors and Ghella

HCS is engaged on the project to provide Underground Service Locating services.

Project: Suburban Rail Loop East – Clayton

Principal Contractor: CPB Contractors and ACCIONA

The Suburban Rail Loop East is Victoria’s largest transport infrastructure project, connecting Melbourne’s middle suburbs via a new 26-kilometre underground rail line from Cheltenham to Box Hill. The Clayton works form part of the AU$3.6 billion tunnelling and station package awarded to the Suburban Connect consortium, comprising ACCIONA, CPB Contractors and Ghella, covering 16 kilometres of twin tunnels between Cheltenham and Glen Waverley and two new underground station boxes. At Clayton, crews have completed all 123 reinforced concrete diaphragm wall panels forming the station box and the underground passenger connection to the existing Clayton Station, clearing the way for excavation to begin. The new Clayton station is planned to connect passengers to the orbital rail network from 2035.

Key aspects of the project include:

• Construction of a new underground Suburban Rail Loop station box at Clayton
• 123 reinforced concrete diaphragm wall panels providing structural support and groundwater control for deep excavation
• An underground passenger connection to the existing Clayton Station
• Delivery by the Suburban Connect consortium of ACCIONA, CPB Contractors and Ghella

HCS is engaged on the project to provide Underground Service Locating services.