The green line extension project is delayed again, city councillor and state Rep. Tim Toomey said Monday.

It’s going to take until 2018 or 2020 to accomplish, he told fellow councillors at the special summer meeting. Its completion was already delayed, to October 2015 from a deadline 10 months earlier.

The green line extension project moves the Lechmere stop to the NorthPoint development side of Monsignor O’Brien Highway; adds a one-stop spur to Union Square in Somerville, roughly where Prospect Street and Webster Avenue meet; and lengthens the line through Somerville into Medford, including to Brickbottom, Gilman Square, Lowell Street, Ball Square, College Avenue and finally to Route 16, to a site near the Starbucks, Whole Foods Market and U-Haul depot. Officially, all but the outermost stop were to be built by October 2015.

The Medford Patch has a more complete report.