| | New Haven Railroad Historical Events |
| | Date | | Category | | Event |
| | 1/20/1855 | | Milestone | THE NEW YORK & NEW HAVEN RAILROAD COMPANY signed an agreement to operate the FARMINGTON |
| | VALLEY RAILROAD and the HAMPSHIRE & HAMPDEN RAILROAD from Granby to Westfield. |
| | 1/30/1857 | | Incorporation | WOONASQUATUCKET RAILROAD COMPANY incorporated in Rhode Island. (Company organized December 1, 1871.) |
| | 1/1/1858 | | Sale | EAST THOMPSON RAILROAD COMPANY affairs closed up. |
| | 1/1/1860 | | Opening of Service | MIDDLETOWN EXTENSION RAILROAD opened Middletown to wharf on Connecticut River. (Operated by HARTFORD |
| | & NEW HAVEN RAILROAD.) |
| | 1/1/1860 | | Milestone | PROVIDENCE, WARREN & BRISTOL RAILROAD COMPANY operated independently until JULY 1, 1891. |
| | 1/1/1861 | | Milestone | Supreme Court of Connecticut issued a mandamus compelling the HARTFORD & NEW HAVEN RAILROAD to run its |
| | trains to the steamboat wharf, after a suit brought by the State of Connecticut. |
| | 1/1/1864 | | Abandonment | MEDWAY BRANCH RAILROAD abandoned and rails torn up. |
| | 1/11/1864 | | Milestone | James Humphrey Hustis, 7th President of the New York, New Haven & Hartford Railroad Company, was born in New York |
| | 1/30/1864 | | Incorporation | BOSTON, HARTFORD & ERIE FERRY EXTENSION RAILROAD COMPANY incorporated in New York, with |
| | authority to construct a railroad at Fishkill and operate a ferry across the Hudson River connecting the BOSTON, |
| | HARTFORD & ERIE with the NEW YORK & ERIE RAILROAD at Newburg. (Company organized January 5, 1864.) |
| | 1/1/1865 | | Opening of Service | NEW BRITAIN & MIDDLETOWN RAILROAD opened New Britain to Berlin, 3 miles. (Operated by the HARTFORD & |
| | NEW HAVEN RAILROAD.) |
| | 1/4/1865 | | Merger | THE NEW YORK & BOSTON RAILROAD COMPANY consolidated with BOSTON, HARTFORD & ERIE |
| | RAILROAD COMPANY under the name of the latter. |
| | 1/4/1865 | | Merger | New York & Boston Railroad (Brookline-Woonsocket) merged into Boston, Hartford & Erie Railroad; incomplete portions |
| | between New Haven and Willimantic are lost. |
| | 1/1/1866 | | Opening of Service | THE NEW ENGLAND RAILROAD opened, Dorrance Street Track, Providence, 0.62 miles. |
| | 1/1/1866 | | Milestone | Edward Grant Buckland, who would one day become President and Chairman of the New York, New Haven & Hartford |
| | Railroad Company and Son-in-law of Charles P. Clark, was born in Buffalo, NY, sometime during 1866. |
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