Sydney built a driverless railway under its harbour. The City & Southwest line, the second stage of Sydney Metro, runs Australia’s only fully automated heavy-rail trains through a new tunnel beneath Sydney Harbour and the central business district. The harbour-crossing section opened in August 2024; the southwest leg follows in 2026.
Project Scope
- A 30-kilometer program built around a new 16-kilometer twin-tunnel crossing under the harbour and the CBD, with seven new underground stations including Barangaroo, Martin Place, and Pitt Street.
- Conversion of 11 existing Bankstown-line stations so they can run driverless trains, the stage opening in 2026.
- Alstom Metropolis rolling stock; harbour and city tunnelling delivered by a John Holland, CPB Contractors, and Ghella joint venture.
- Budget escalated to about A$20.5 billion, roughly A$9 billion above early projections.
Why It Matters
This is the first rail crossing built under Sydney Harbour since the Harbour Bridge opened in 1932. Driverless operation means turn-up-and-go frequency rather than a timetable, which changes how the city moves. The cost is part of the story too. A government review flagged the roughly A$9 billion escalation over initial estimates, a reminder that automated metros buried under a harbour rarely come cheap. The line forms the spine of a transport build-out that also includes the new Western Sydney International Airport.
Project Team & Details
| Developer | Sydney Metro (NSW Government) |
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| Owner / Client | Transport for NSW |
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| General Contractor | John Holland / CPB Contractors / Ghella JV (tunnelling) |
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| Major Subcontractors | Alstom (Trains & Systems) |
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| Status | Under Construction |
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| Funding Source | Public (State) |
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