The MBTA has lifted 10 speed limits on the Orange Line after completing “critical” track work, while train service between the Wellington and Back Bay stations was suspended from May 28 to June 6, officials announced Monday.

But the work is not over yet. The remaining speed limits between Community College and Sullivan Square will be addressed later this month, officials said.

Over the weekend of June 22-23, train service between Oak Grove and North Station will be suspended to allow for signaling work, and from June 24 to June 30, shuttle buses will also replace trains between Wellington and North Station for bridge and track improvements. officials said.

During those times, passengers can use the Haverhill Line on the commuter rail for free service to and from Oak Grove, Malden Center and North Station, officials said.

During the latest closure, crews replaced more than 10,000 feet of running rail, nearly 400 sleepers, and resurfaced and reconsolidated more than 7,000 feet of track. Additional work was performed at Orange Line stations during the closure. For example, at the Tufts Medical Center station, signage was cleaned, new LED lighting fixtures were installed and escalator paving stones were replaced. Other stations received new coats of paint, new signage, new floor tiles and new drains, officials said.

In November, the MBTA announced a sweeping plan to shut down portions of the four subway lines for repairs over the next fourteen months to eliminate slow zones. This spring, the Blue Line reopened without slow zones caused by track defects after a 14-day closure of much of the line.

MBTA General Manager Phillip Eng said he was proud of MBTA employees and contractors for delivering “critical upgrades.”

“There is more work to be done on the Orange Line at the end of this month, and I thank our passengers for their patience as we work to give them a safer, smoother and more reliable journey,” Eng said.

Emily Sweeney can be reached at [email protected]. follow her @emilysweeney and on Instagram @emilysweeney22.