The Middlesex Corporation is the lead on a joint venture with Tutor Perini Construction, and selected to build the South Coast Rail, Middleboro Secondary & New Bedford Main Line (MS/NBML) Commuter Rail Expansion (Phase I).

Scope involves four major elements: (1) the construction of approximately 25 miles of new trackway along the existing Middleborough Secondary and New Bedford Main Line Right-of-Way from Middleborough to New Bedford, (2) the construction of four commuter rail passenger stations, (3) the construction of an end of the line layover facility, and (4) the construction of South Coast Rail program-wide signals and communications systems.