I didnt know about this one, thats great https://inlandrail.artc.com.au/what-is-inland-rail/Our antiquated rail system is quite the opposite, and the Main South rail line is far from empty - it moves huge quantities of goods as well as bulk loads like wheat and minerals every day. Even Melbourne is a major goods destination. The number of lorries is hugely reduced. If you look at the long streams of rail containers you will see the truckers' trademarks - Toll, Linfox, etc. Containers not on the roads. Even Sydney's garbage goes by train (to Tarago)!
Most traffic passes through NSW. There's a new line being built to connect Melbourne to Brisbane directly. That's major expenditure, then you can add on the Sydney developments.
This is a long way from C5 cars. The new car bodywork is a touch vulgar for my taste, ie "styled" but it looks on the money in many ways.
Still some ways to go though, passenger services are a long behind. Still no high speed services and none expected in my lifetime.