Sydney Metro City & Southwest project

Sydney Metro City & Southwest is an under-construction 30 km (19 mi) rapid transit railway line in Sydney, New South Wales, Australia. The project will extend the Sydney Metro network from the southern end of Sydney Metro Northwest at Chatswood on the North Shore, to Bankstown in the city's south-west via the Sydney central business district. The centrepiece of the project is a new 15.5 km (9.6 mi) twin-tunnel rail crossing under Sydney Harbour and through the city to Sydenham. Together with planned improvements to the Main Western line, the project is expected to increase capacity on the Sydney rail network by up to 60%, and allow for the movement of over 100,000 extra commuters across the network every hour. The line began construction in 2017 and is planned to open by 2024. It is estimated to cost between $10–11 billion.