"I make no apology for making my views clear on that," he said.
"We cannot pretend that there is some magic way of funding infrastructure that doesn't impose any costs on anyone.
"We will need to look in part to private sector options. No funding has been set aside for light rail, for example. Without government funding, a public-private partnership will be necessary if light rail is to finally become a reality."
Auckland Mayoral candidate Mark Thomas rubbished Mr Goff's "enthusiasm for an untested and unfunded light rail system serving central Auckland".
"Throwing support behind undeveloped and unfunded ideas has been a hallmark of Len Brown's mayoralty," Mr Thomas said.
"Aucklanders are still waiting for rail to Albany and rail to the airport the Mayor promised in his first election campaign. Labour's candidate is falling into the same trap."
Mr Thomas said Mr Goff was also confusing his funding options.
"While congestion charging or tolls can have a role to play in a congested transport system - if there are free alternatives - tolling shouldn't be used as 'money grab' to pay for other projects," he said.
The race for the Auckland mayoralty begins this evening at a "meet the candidates" outing organised by the Ellerslie Residents Association.
Six mayoral candidates will be attending - Mr Goff, Victoria Crone, Mark Thomas, Stephen Berry, Penny Bright and David Hay.
