A high-speed rail project connecting NSW cities has been encouraged by a federal advisory body. Photo: PR IMAGE PHOTO

Commuters will hop onto Australia's first high-speed trains in just 12 years if the latest proposal for the nation's rail network leaves the station.

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Stretching almost 200km from Newcastle to Sydney, newly released details have the long-touted line being built in three in stages with the final section opening in 2042.

Infrastructure Australia recommended pushing ahead with the plan in its evaluation of a business case, which the Albanese government has been sittin

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