Jabarkan Blue Line dari Massachusetts Bay Transportation Authority

There is a proposal to extend the Blue Line northward to Lynn, with two potential extension routes having been identified. One proposed path would run through marshland alongside the existing Newburyport/Rockport commuter rail line, while the other would extend the line along the remainder of the BRB&L right of way.

In addition, the MBTA has committed to designing an extension of the line's southern terminus westward to Charles/MGH, where it would connect with the Red Line. This was one of the mitigation measures the Commonwealth of Massachusetts agreed to offset increased automobile emissions from the Big Dig, but it was later replaced in this agreement by other projects.