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TBMs reach halfway mark to St Marys


Tunnelling is in full bore on the Sydney Metro-Western Sydney Airport project, with tunnel boring machines (TBMs) Catherine and Marlene already halfway to the new St Marys Metro Station site.

Both machines have already helped to build 2.4 kilometres of tunnels. Tunnelling at an average speed of 120 metres a week, the TBMs are carving out the twin 4.3km tunnels to St Marys.

They have removed 600,000 tonnes of spoil so far and have helped to install 17,820 precast concrete segments since being launched at the Orchard Hills Station site in July and August 2023. Both TBMs are expected to reach St Marys in mid-2024.

The 23km new railway will link residential areas with job hubs including the new Aerotropolis, and connect travellers from the new airport to the rest of Sydney’s public transport system.

The Australian and NSW Governments have awarded all three major contracts for the Sydney Metro-Western Sydney Airport project. The tunnelling contract was awarded in December 2021 to CPB Contractors and Ghella Joint Venture to build the new twin metro rail tunnels.

In March 2022, the contract to deliver about 10.6km of elevated viaduct, earthworks for track formation, a rail bridge over the new M12 motorway, a rail bridge within the airport and associated works, was awarded to CPB Contractors and United Infrastructure Joint Venture.

In December 2022 the largest Public Private Partnership (PPP) contract in New South Wales was awarded to Parklife Metro. The consortium will deliver six new stations between St Marys and the new Aerotropolis, 12 new metro trains, core rail systems and the stabling and maintenance facility to be built at Orchard Hills.

Parklife Metro will also operate and maintain the Sydney Metro-Western Sydney Airport line for 15 years after it becomes operational.

A further two TBMs, Eileen and Peggy, are building the two 5.5km southern tunnels from Airport Business Park to the Aerotropolis.

When the new metro line opens, passengers will have a world-class transport option directly to the new Western Sydney International (Nancy-Bird Walton) Airport and major job hubs, including the new Aerotropolis.



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