The federal government is set to fork out $30 million for 1000 new car parking spaces at Campbelltown and Macarthur stations.
However the location of the new parking spaces could be a problem.
Hume MP Angus Taylor welcomed the funding announcement which will deliver up to an additional 500 parking spaces at Campbelltown station and a further 500 at Macarthur station.
Mr Taylor said the commitment would complement the NSW Government's announcement in February of an additional 350 car parking spaces at Leppington Station.
"I have been directly involved in lobbying for these extra 1000 spaces," he said.
"I have been pushing the case with the Minister for Cities Alan Tudge for many months now.
"This is a great commitment, benefitting commuters from Camden, Narellan, Penrith, Picton, Bargo and through to the Southern Highlands.
"It's a transport strategy that is smart and clear and will have a real impact."
The state government last year broke its 2015 election promise to build 450 additional commuter parking spaces at Campbelltown Station.
A letter revealed the government had investigated five sites around the station for potential multi-storey car park developments.
Two were deemed too far away or unsuitable due to town planning.
Four of the five - including a Department of Planning-owned site on Langdon Avenue - were said to have required the acquisition of property which would have cost more than approved funding for the project.
According to the letter there was only one remaining viable allocation - 4 Farrow Road.
That site is owned by Campbelltown Council. At the time the council refused to give up the land to the government, but was willing to lease it on a temporary basis while the car park was constructed at a different site - namely Langdon Avenue.
A spokeswoman for Mr Taylor said there were no further details on where the promised car park would be built or when.
"As with all of our infrastructure commitments across the country, we'll work with the state government and council to determine next steps, including regarding preferred location," she said.
"Further details will be available as the discussions progress."
Mr Taylor said the Campbelltown and Macarthur car parking boost was part of an additional $167.5 million for Western Sydney commuter car parks, to get residents out of traffic.
"Whether it's the new airport, the North South Rail Link, or our congestion-busting road projects, we are working hard and in partnership with the Berejiklian Government to support a major transformation of western and south-western Sydney," he said.
"We have also committed $3.5 billion to rail infrastructure that will be up and running the day the airport starts operating.
"All of this means more jobs for the people of Hume and our infrastructure plan will get everyone home sooner each day.
"The only way Bill Shorten and Labor will be able to pay for new road and rail projects for Hume commuters is by placing at least $387 billion in new and higher taxes on the hardworking residents of areas like Penrith, Camden, Narellan and Picton."