Among the options for high speed mass transport under consideration is Hyperloop, a brainchild of Elon Musk. Capsules contained within large tubes could enable travel at up to 1200 kph, but critics reckon the technology is not ready and that we should be looking at more conventional very fast trains.
Further Reading
Sydney to Melbourne in 40 minutes: Hyperloop idea pitched to government
Labor rebuffs Elon Musk’s ‘hypothetical’ Hyperloop to solve Australia’s transport woes