That's a long time ago. How much has changed since then? Or more accurately what, if anything is still the same?
- Mandurah line
- Kwinana freeway & Forrest Highway
This could be well worth a revisit, using the Mandurah line as the main access route from Perth. Apart from a few problems getting out of Mandurah, an alignment to somewhere around Yunderup then down the Forrest Highway would be quite feasible. Single line construction in a dual track corridor - no level crossings and diesel operated at 160-200km/h. This would be fast enough to be competitive with road, but not too heavy on new technology or fuel costs. Alignment selection could still allow eventual higher speeds with electric trains
Would probably need to be many years off, given the state's current financial position, but there would certainly be no harm reserving the corridor before it gets built on.
For access to Perth, it could start off with a simple connection (change trains) at Mandurah (or possibly extend the electric service to a park & ride station somewhere out near the freeway) but no doubt there would be a lot of customer pressure for direct services to Perth.
Operating diesel trains through the (relatively short) tunnels in the CBD could be achieved by relatively small energy storage on the trains so diesel engines could be shut off. Turnback could use the siding at Leederville.