BOSTON (AP) - The price tag for the MBTA's planned Green Line extension into Somerville and Medford could come in at up to $1 billion more than first estimated.
The cost to the state for the expansion was initially projected at about $2.3 billion.
MBTA officials told reporters on Monday that the cost could balloon by an additional $700 to $1 billion, putting the future of the project in question.
The 4.7-mile project calls for the construction of six new stations, the relocation of one existing station, and the purchase of new light rail vehicles.
State transit officials are looking at a range of options, from redesigning the project, coming up with additional funding, renegotiating with the contractor, or abandoning the extension.
Federal officials have already promised nearly $996 million to the project.
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