The projects announced by Feds in Qld and NSW, not sure on Vic and elsewhere were mostky aligned with state govt wish lists, Qld at least had published as such not long back.
As the funding is co funding, if they don't go ahead then it's a state problem.
SA ALP had its own wish list which was presented at election and the feds announcement had time for a discussion on what is in big picture not alot of money for feds.
The SA Road projects will no doubt proceed.
Baroosa Valley has what 10 x population and comparable to other outer commuter belts and the states biggest tourist destination. Its absurb to think a rail line would be a ghost town. Technically the lines reconstruction is very straight forward and rolling stock is available today.
MB which I also support has a number of road blocks which are not insurmountable, but a challenge.