vhst is not a vote winner. It is a vote loser and their are other ways to reduce our carbon emissions since a vhst would actually use quite a lot of coal to keep the 25kv running.
The NSW govermnets new alignment building is the real vote winner.
It is possible to use renewable electricity on a HST but not on a plane.
Existing patronage makes it economically viable Sydney to Melbourne but there is no guarantee about the economic viability in connecting smaller towns and I don't think NSW has got any money but the Fed can print it and solve the decentralization problem at the same time as immigrants only want to live in big cities where the good jobs are.