Expressions of interest have been called for the first two tunnelling contracts from Westmead to Sydney Olympic Park and from Sydney Olympic Park to The Bays.
The first of four tunnel boring machines are expected to begin working by the end of 2022.
The Sydney Metro West project will deliver a new underground driverless metro railway from Westmead to the centre of Sydney, doubling capacity along the corridor and cutting travel times to around 20 minutes between Parramatta and Sydney.
The project is expected to create more than 10,000 direct new jobs and 70,000 indirect jobs, including thousands from the new tunnelling contracts.
For detailed information on metro project tenders from around the world, subscribe to IRJ Pro.