Australia’s New South Wales (NSW) Government is set to begin construction of the new Sydney Rapid Transit (SRT).

An extension to the North West rail link, the move forms a part of the government’s Western Sydney Rail upgrade programme; a new multi-billion dollar investment to be made to the existing train network.

The proposed rapid transit rail line under Sydney Harbour, will run through the CBD and on to Bankstown.

"This package of significant rail projects will unlock Sydney’s rail capacity for generations to come and will benefit rail commuters across the entire network."

Work to modernise the existing signalling network will begin immediately, in order to allow more express trains from Penrith, Parramatta and Blacktown to the city.

NSW Premier Mike Baird said: "This package of significant rail projects will unlock Sydney’s rail capacity for generations to come and will benefit rail commuters across the entire network.

"Whether they are in Gosford, Parramatta, Liverpool, Hornsby or Penrith, they will have more services and improved reliability. This will free up capacity so customers right across Sydney and our regions are catching more frequent trains with less crowding."

The provision of new train services will benefit intercity customers, as well as improve travel times for customers in the south-west and western parts of Sydney.