A $1.8 billion contract has been awarded to CPB Contractors and Ghella to build the new twin metro rail tunnels as part of the Sydney Metro – Western Sydney Airport project.
The first of four tunnel boring machines (TBM) will begin tunnelling by early 2023 to deliver 9.8 kilometres of twin rail tunnels in two sections.
The 23-kilometres metro line will link St Marys to the centre of the new Aerotropolis via the new Western Sydney International (Nancy-Bird Walton) Airport, with six stations to be built along the alignment.
The contract also includes excavation and civil works for new stations at St Marys, Orchard Hills, Western Sydney International (Nancy-Bird Walton) Airport, and Aerotropolis.
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Two temporary precast concrete factories will be built for the project on the Western Sydney International site. More than 67,000 concrete segments will be used to line the twin tunnels.
TBM launch sites will be built at Orchard Hills and Western Sydney International, with two TBM retrieval sites to be built at St Marys and Aerotropolis Station.
Once the tunnelling contract is complete in late 2024, work will continue to lay tracks and fit out stations.
The Federal and NSW governments are jointly delivering the metro railway and six stations between St Marys and the Western Sydney Aerotropolis, including two stations at the airport.