Southbridge and Blackstone Railroad

In 1853, with construction underway, it was merged into the Boston and New York Central Railroad (B&NYC).

The B&NYC used the charter of the East Thompson Railroad, another of its constituent lines, to alter the routing: west of East Thompson, Connecticut, the merged line continued southwest to Mechanicsville, Connecticut, where it met the Norwich and Worcester Railroad.

[1] A successor company, the Boston, Hartford and Erie Railroad, completed the originally-planned Southbridge–East Thompson segment in 1867; it became the Southbridge Branch.

The remaining section from Willimantic to North Windham lasted until the mid 1980s.

The Connecticut portion of the line was later converted to part of the Air Line State Park Trail, and the Massachusetts portion to part of the Southern New England Trunkline Trail.