Work on the extension of the Green Line to Somerville and Medford is likely to be delayed again after it was revealed the project could end up as much as $1 billion over budget.
Some parts of the project will continue to move forward while others have been halted until possibly next spring.
The state has hired four outside firms to evaluate how the project has gotten so far without a full understanding of what it would cost and find ways to reduce costs.
The cost of the analysis by the four firms will not exceed $1.5 million a spokesman said.
(more on the delays and cost overruns for the Green Line extension project...)
