New York, Providence and Boston Railroad
The New York, Providence and Boston Railroad was a continuation of the Shore Line Railway past New London to Providence, Rhode Island. The line was incorporated in 1832 and opened in 1837. The New Haven leased it in 1892, merging it into itself on February 13, 1893.
Housatonic Railroad
The Housatonic Railroad, chartered 1836 and opened 1842 (with branches opening later), had a line from the New Haven in Bridgeport north, passing east of Danbury, to West Stockbridge, Massachusetts (later the Boston and Albany Railroad in Pittsfield). The Housatonic leased the Danbury and Norwalk Railroad (opened 1852), running from Danbury (to which the Housatonic had a branch) south to Norwalk on the New Haven, in 1887, and it leased the New Haven and Derby Railroad (opened 1871-1888), a branch to New Haven, in 1889. On July 1, 1892 the New Haven leased the Housatonic, giving the New Haven all the north-south lines in western Connecticut.