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    Alliance wins $6.7B SRL East linewide package: interfaces and risks for engineers

    December 18, 2025|

    Reviewed by Tom Sullivan

    Alliance wins $6.7B SRL East linewide package: interfaces and risks for engineers

    First reported on Roads & Infrastructure (AU)

    30 Second Briefing

    The Linewide Alliance of KBR, WSP, Alstom, RATP Dev and John Holland has secured the $6.7 billion Linewide package for Melbourne’s Suburban Rail Loop (SRL) East, covering systems and infrastructure for a fully tunnelled 26‑kilometre twin‑bore metro corridor. Works include rail systems, power, signalling, communications and high‑capacity rolling stock integration for the orbital line linking Cheltenham to Box Hill. Geotechnical and civil interfaces will be critical, with continuous underground alignment, multiple underground stations and complex M&E fit‑out in constrained urban environments.

    Technical Brief

    • Alliance structure formalises KBR, WSP, Alstom, RATP Dev and John Holland under the Linewide Alliance banner.

    Our Take

    Within our 310 Infrastructure stories, very few Australian rail items approach the capital intensity of the SRL East linewide scope, signalling that Melbourne’s corridor will likely act as a national reference point for future fully tunnelled metro procurement and risk allocation.

    The presence of KBR, WSP, Alstom and RATP Dev together on the SRL East Linewide package suggests Victoria is locking in global metro-operations and systems expertise early, which typically shortens later integration and testing phases on 20–30 km class tunnel projects.

    For Melbourne and Victoria, a 26 km continuous twin-tunnel corridor concentrates construction interfaces in dense urban areas; in our database, similar-scale underground packages have driven sustained demand for specialist TBM crews and complex utility-diversion workforces over multi-year periods.

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    Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.

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