The revived plan to build new rail tunnels under the Hudson River appeared to gain momentum on Tuesday, as the federal transportation secretary, Anthony Foxx, and New Jersey officials agreed at a meeting to work together to move forward on it.

After Mr. Foxx met with Gov. Chris Christie of New Jersey and the state’s two Democratic senators, Cory A. Booker and Robert Menendez, the officials signaled a new level of cooperation on the project. The four released a joint statement calling the meeting “substantive and productive,” and indicated that they would work to obtain “a substantial federal grant contribution” and other funding options for the plan, known as the Gateway Project.

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