The MBTA will close a broad stretch of its Green Line for 15 consecutive days in December as it replaces a piece of the subway tunnels dating back to their original construction nearly 130 years ago.

From Dec. 8 through Dec. 22, the T will suspend service from North Station to Babcock Street on the Green Line’s B Branch, to Kenmore on the line’s C and D Branches and to Heath Street on the E Branch, the agency said.

“For a planned shutdown, this is huge,” Brian Kane, the executive director of the MBTA Advisory Board, said Tuesday when informed of the looming closure. “That’s the entire trunk [of the Green Line], basically. That’s major.”

While the lines are closed, MBTA work crews will replace a “wooden overhead catenary wire ‘trough’” running along the ceiling of the train tunnels, the

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