A standard heavy rail line from Epping to Rouse Hill is looking like the best part of $10billion.
How much would a high speed rail line to Canberra or Williamtown cost? Compulsory acquisition of how many Sydney properties at the best part or $600k per 500m2 block? Running along the Great dividing range? Crossing the Hawkesbury River and going under / above the hills and valleys from there up to Wyong? How much would it cost to maintain that distance of high speed line? What sort of subsidy would be required to cover the costs of 200km (to Willy) or 300km (to Canberra) high speed journeys?
Next bit - move the ADF out (RAAF out of Richmond or Willy, Army out of Holsworthy, RAN out of Sydney for the benefit of cruise ships). To where? How is it that every member of the ADF apparently will be happy to live in Tindal or Weipa or Cultana or some other Godforsaken outback dump? Care to explain how recruitment and retention will be addressed? Care to explain how FLTLTs and CAPTs and SGTs and the like will be replaced when they get the choice of losing their marriage or leaving the ADF?
The Auditor General identified an average per member additional cost of $15k p.a. to maintain 1 BDE in Darwin. Watch retention when Op SLIPPER ends and there are no trips and medals any more .... 1 & 3 BDE will bleed. The Army has to work hard to post people out of 7 BDE in large part because they'd prefer to live in Brisvegas than Darwin or Townsville. Why is 7 RAR now at RAAF Edinburgh instead of Robbo?
How much does it cost to train RAAF aircrew? If the only posting locations are Curtin / Scherger / Learmonth / Tindal consider how much more it will cost to recruit and train.
The Gummint already owns Badgery's Creek. All it takes is is an ounce of political gumption. It's the right answer. Everyone knows it is.