The Opposition has lifted its election promises to $2 billion in three days, unveiling the third major plank of its ambitious Metronet rail plan.

Opposition Leader Mark McGowan today gave details of the proposed North Circle part of the Metronet rail project, which is designed to serve Perth's growing suburban fringe while easing congestion in the city.

The $616 million section of the proposed rail network would connect the existing Joondalup line and the proposed Ellenbrook line, delivering a connected rail service to the Perth's northern suburbs.

The announcement followed the unveiling of the $863.5 million Ellenbrook line yesterday, and the $731.5 million Perth Airport rail line on Tuesday.

Mr McGowan said construction on the North Circle line would begin in 2013/14 and would service stations at Perth Central, Claisebrook, Maylands, Bayswater and Stirling, while building four new stations in Malaga, Mirrabooka, Hamersley and Balcatta.

Labor has costed the Metronet project at $3.8 billion over eight years, while the Liberals place the cost at $6.4 billion.

Mr McGowan said the North Circle line's $616 million did not include the cost of rail carriages.

The West Australian

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