There will be a new station at Crows Nest plus stations at North Sydney, Barrangaroo and Martin Place.
Travel tomes between the city and Chatswood are expected to improve by 10 minutes.
The planned station at Artarmon has not been dropped. Also, they have still to decide on a station at Sydney University or Waterloo.
The biggest benefit of the extension of the Metro beyond Chatswood to the city is the relief this should bring to overcrowding on the Chatswood stations when the Metro commences.