The modern Greenbush Line was originally built as the South Shore Railroad, which opened to Cohasset in 1849.

[3][4] After financial troubles in the 1870s, the Duxbury and Cohasset was joined with the South Shore under the fold of the Old Colony Railroad in 1877.

The number of daily trips was increased from 4 to 8 after World War II under Frederick C. Dumaine, Jr., and modern diesel trains including Budd RDCs were introduced in the 1950s.

After much controversy surrounding various aspects of the $534 million project, construction of the Greenbush Line was completed in mid-2007.

The Greenbush line and North Scituate station were opened for full service on October 31, 2007 after a ceremonial train the previous day.