The party says it could save $4.5 billion by scrapping the WestConnex motorway, which would largely run under Sydney's inner west. That funding would be redirected to public transport projects, with about $250 million slated for cycling projects.

But the Greens would also not fund work on another harbour rail crossing for the next five years. The state government, which says the line will soon be necessary, says it could start work on the $10 billion project by 2017 if it raised money privatising electricity assets.

Dr Faruqi said the crossing might ultimately be required, "but there are other ways we can increase capacity across the network now". She suggested improved signalling systems to allow more frequent trains.

The Greens' approach would be to allocate $1 billion to the Epping to Parramatta rail line, which was promised by the previous Labor government but scrapped by the Coalition in favour of the North West Rail Link. This line had been costed at about $2.6 billion, but Dr Faruqi said: "it's well known that rail costs in NSW are overblown compared with elsewhere".

The party is also pledging $2.1 billion for a light rail fund to allocate money to projects around Parramatta, Parramatta Road and Green Square, and says it would spend $450 million buying the Airport Rail Link and lowering fares on the line to those of the rest of the network.