BOSTON (CBS) — The MBTA announced Thursday that it has cancelled contracts with four firms working on the Green Line Extension.

The MBTA’s Fiscal and Management Control Board (FMCB) said they also plan to restructure the management team for the project and appoint a new interim project manager. These decisions were made following a joint meeting of the FMCB and the MassDOT Board of Directors.

“Today’s actions are necessary steps to resolving the future of the GLX project,” said FMCB Chairman Joseph Aiello.

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The FMCB must also approve all new construction contracts and actions having to do with the Green Line Extension over the next 90 days, as the MBTA makes efforts to reduce costs and have an accurate budgeting plan in place. It was announced earlier this year that the Green Line Extension was expected to exceed budget estimates.

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The two boards had been briefed on a review that found that unrealistic schedule demands led to higher costs. That review found the construction manager/general contractor’s project delivery method had several flaws, and did not allow for finishing a Green Line project redesigned to be more affordable.

An MBTA release said the decision marks the beginning of a transitional period where no additional work will be awarded, but construction work that is already in progress and under contract will continue.

The MassDOT board and FMCB will meet again December 14 to consider more options.