The Barnett Government has written the final chapter of its impressive catalogue of total failure on public transport delivery, admitting at last that its draft public transport plan has been abandoned and will never be finalised.

Greens spokesperson for sustainable cities, Senator for Western Australia Scott Ludlam, says now Colin Barnett has accepted the Greens-led push to build light rail in Perth, the Greens will maintain pressure to ensure Federal funds flow to the project.

"How awkward; Colin Barnett's WA Government Budget today assumes the realisation of May 2013 Federal Labor commitment for $500 million rail in Perth - and yet Mr Abbott has famously ruled out funding any urban rail if he is elected," Senator Ludlam said.

The Greens have congratulated the State Government for its light rail announcement, but warned that the project must be brought forward and begun immediately.

"Working with local government, industry, planners and the broader community over the past four years I have seen the enthusiasm for light rail in Perth grow rapidly," said Australian Greens transport spokesperson Scott Ludlam.

The Greens have welcomed Premier Colin Barnett's announcement to the Chamber of Commerce that electrified light rail should be built in Perth within the next decade.