Back-to-back, marathon labor negotiations are happening upstairs on the 16th floor of MTA headquarters Friday, John McCarthy, its chief of policy and external relations, told Newsday as he walked into the building.

At 9 a.m. talks began with the Transport Workers Union, whose contract is just lapsing.

At 11 a.m., he said, they will resume the most imminently consequential talks — with the five Long Island Rail Road unions threatening to strike beginning at midnight unless a deal is reached.

Helming them both is Gary Dellaverson, a veteran lawyer and MTA finance official who retired from the agency but has been brought back to lead the negotiations on its behalf.

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