Crews work on MBTA Orange Line tracks at the agency's Wellington maintenance facility on Aug. 3, 2022. State House News Service photo | File

Talks are already underway between Gov. Maura Healey, state lawmakers and unnamed “stakeholders” about what kinds of taxes and fees are necessary to address a massive list of infrastructure needs at the MBTA, Healey said Thursday.

Representing her administration’s latest indication that the governor wants to reopen a debate about how the state funds transportation investments, Healey told WBUR it will take “a lot of thinking” to figure out “the kind of revenue that we need” to tackle the $24.5 billion in estimated capital needs at the T.

“In terms of revenue for larger investments in infrastructure in the long term, that’s a subject of ongoing discussion with the legislature, with stakeholders on this,” Healey said in an interview on “Radio Boston.” “I credit the number. There’s a lot of thought that went into that, but it’s going to take a lot of thinking about how to get there in terms of the kind of revenue that we need for that.”

Healey did not make clear whether she and lawmakers are discussing new transportation-related taxes and fees, or instead eyeing the state’s relatively new surtax on high earners as a way to fund repairs to MBTA assets currently not in a state of good repair.

Asked if Healey was referring to surtax revenues or to a new proposal for transportation revenue, a Healey spokesperson did not directly answer.

“Our administration is in constant contact with our state and federal government partners and other stakeholders about how to best address the infrastructure needs of the state,” spokesperson Karissa Hand said.

Voters last year approved the 4 percent income surtax, whose revenue is supposed to be earmarked solely for use on education and transportation investments. Healey’s Department of Revenue estimated this week the levy will bring in between $1.58 billion and $2.06 billion in fiscal 2024, significantly more than the $1 billion allocated in the current state budget.

Healey and her deputies have been hinting for weeks that they might look to generate new revenues for transportation and particularly MBTA spending. The House in 2020 – before voters approved the surtax – advanced a package of taxes and fees designed to support the transportation sector, but it died without a Senate vote and legislative leaders have not signaled plans to return to the topic since then.

The T already receives funding in the state budget, from a dedicated portion of the state’s sales tax, and from cities and towns with MBTA service, but budget-writers project a gap of hundreds of millions of dollars will erupt in the next few years.

“The amount of money that is coming from the legislature is not enough. And I don’t think that that’s even a controversial thing to say; that’s just simple math. It isn’t enough,” Transportation Secretary Monica Tibbits-Nutt said last month, adding that “we want to bring in additional sources of revenue.”