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.

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 sitting on since the High Speed Rail Authority finished it in 2024.

The nation-building project would ultimately allow passengers to travel between the two most populous NSW cities at up to 320km/h, cutting the travel time from Newcastle to Sydney more than two-and-a-half hours to one hour.

Six stations would be built in total. Th

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