Auckland Mayor Len Brown says the $2.86 billion central rail loop remains the prime project in his first 10-year budget, which faces a bumpy ride from councillors on Wednesday.
The day before Finance Minister Bill English unveils the Government's Budget, Mr Brown and councillors will lock horns in the Auckland Town Hall over a $58 billion Super City budget.
Mr Brown said the council could not back off the need to invest in the future of the city and deal with major growth, but the budget had to be fair, just and prudent to the city's 516,000 residential and business ratepayers.
Despite growing criticism towards the central rail loop, Mr Brown said it still had strong support.
The mayor's determination for the 3.5km underground rail loop will be tested with a call by Citizens & Ratepayers and other right-leaning councillors to freeze funding on the project until it has Government backing.