West Australian opposition leader Mark McGowan has made yet another announcement about his party's $3.8 billion Metronet project - an additional 17,000 car bays across the rail network over the next eight years.
Mr McGowan says if Labor wins the March 9 state election he will provide close to 5000 additional car bays across the Perth rail network in his first term of government.
"WA Labor will build on average more than 750 car parking bays at each station built under Metronet, excluding the new Perth Airport station," he said.
"We will include a number of super car parks at some of the outer metropolitan stations with up to 2000 bays, including the new Atwell Station."
Mr McGowan said he would also trial satellite car parks away from train stations with regular bus feeder services direct to the stations.
"Feeder buses and satellite stations are part of WA Labor's long term plan for Metronet to have high frequency buses feed into our transport network," he said.
The estimated total operating cost for the latest announcement was $700,000 a year, including feeder bus services and security at car parks, Mr McGowan said.
He also promised that if he won the election, he would resign after his first term if work had not begun on the airport rail line.
"It will be underway in the first term of a WA Labor government and I would resign if it wasn't underway," he told ABC radio.
"I've said it will be constructed by 2018. That is our expectation."
The Metronet project would include a 10.5km rail line to Perth's international airport - and would serve domestic terminals when they are relocated to adjacent land in coming years - at an estimated cost of $731.5 million, not including rail cars.
The line to the airport would include new rail stations in the eastern suburbs of Redcliffe and Forrestfield/High Wycombe.
The WA Liberal government has mocked the ambitious scheme, saying it's more likely to cost $6.4 billion.