The Sydney Metro is Australia's largest public transport project, and as of 2026, the network is expanding rapidly across several key corridors. The Sydney Metro City & Southwest line (which opened in 2024/25) currently runs from Chatswood, under Sydney Harbour, through new CBD stations like Martin Place and Gadigal, and out to Sydenham and Bankstown. The major "new" project for 2026 is the Sydney Metro – Western Sydney Airport line, which is under construction to connect St Marys to the new Western Sydney International (Nancy-Bird Walton) Airport and the new "Aerotropolis" city center at Bradfield. This line will feature six new stations and is designed to open in sync with the airport's first commercial flights. Simultaneously, work is progressing on the Sydney Metro West, which will eventually link Westmead and Parramatta to the Sydney CBD in the late 2020s, passing through Olympic Park and The Bays. This massive infrastructure shift is transforming Sydney into a "30-minute city" where high-frequency, driverless trains connect the disparate geographical hubs of the metropolitan area.