Contract Awarded for $2.81 Billion Sydney Harbour Rail Tunnel


A joint venture of CPB Contractors (45%), John Holland (45%) and Ghella (10%) have won a $2.81 billion contract to build a Sydney Metro railway crossing under the Sydney Harbour.

The contract for the Sydney Metro was awarded by the Government of New South Wales and will involve the construction of two 15.5km tunnels and the associated civil works.

CIMIC Group Chief Executive Officer Adolfo Valderas spoke about this significant project,

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“It is our privilege to be working with Transport for NSW and the NSW Government to deliver this world-class and next-generation infrastructure initiative, which will be of lasting value for the people and communities of Sydney.”

This tunnel is Stage 2 of the Sydney Metro Project which will link Chatswood to Sydenham. The tunnel is a will be excavated using five tunnel boring machines (TBM’s), which will travel under the Sydney Harbour and the CBD.


Design and construction of Stage 2 of the Sydney Metro Project includes;

  • Twin 15.5 kilometre tunnels from Chatswood to Sydenham travelling under Sydney Harbour and the CBD using five tunnel boring machines (TBMs).
  • 57 cross passages approximately every 240 metres between the tunnels and a temporary access shaft at Blues Point.
  • Tunnel dive structures at Chatswood and Marrickville.
  • Excavation of six new underground metro stations at Crows Nest, Victoria Cross, Barangaroo, Martin Place, Pitt Street and Waterloo.
  • A crossover cavern at Barangaroo to allow trains to cross from one track to another.
  • Design and manufacture of about 99,000 precast concrete segments to line the tunnels.
  • Demolition and removal of existing buildings on the construction sites

Sydney Metro

Tunneling will begin in early 2018 and early works are expected to begin in the coming weeks. Tunnelling is expected to be completed in mid-2021 while the entire project will be completed in 2024.

Sydney Metro Project Timeline

Once completed the new Sydney Metro will extend for 66 km connecting dozens of suburbs.

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