"We know the Western Sydney Airport and the aerotropolis are the future of Sydney and that is why we are making the investment now for construction on the rail line to begin in 2021,"she said.
"At the same time we are building the crucial road links and are investing $3.6 billion to build the new M12 motorway and upgrade existing roads including the Northern Road and Bringelly Road."
Loading
The aerotropolis - the area centred on the airport,to be named Nancy-Bird Walton - is expected to create 200,000 jobs.
The metro line will run from St Marys Station through the new airport to the new aerotropolis,providing an interchange with the existing Sydney Trains T1 Western Line.
With the state poll two weeks away,the state and federal Liberals are determined to show a united front. The state and federal government will split the costs under the Western Sydney City deal.
The federal government is fully funding the new airport with $5.3 billion. Prime Minister Scott Morrison said his government will also provide a $3.5 billion"rail package commitment".