Sydney Metro is a fully automated rapid transit system located in Sydney, New South Wales, Australia. Currently consisting of one line that opened on 26 May 2019, it runs from Tallawong to Chatswood and consists of 13 stations and 36 km (22.4 mi) of twin tracks, mostly underground.

 

Work is progressing to extend this line from Chatswood to Bankstown, running under Sydney Harbour and the CBD with a scheduled 2024 completion. When completed, this line will have 66 km (41.0 mi) of twin tracks and 31 stations in total.

The Sydney Metro West project has also been announced and will run from the CBD to Westmead, including 24 km (14.9 mi) of underground twin tracks and seven stations. 

According to en.wikipedia