| | New Haven Railroad Historical Events |
| | Date | | Category | | Event |
| | 7/1/1856 | | Opening of Service | NEW HAVEN AND NORTHAMPTON RAILROAD opened, Westfield to Northampton, Massachusetts, about 15.78 miles. |
| | 7/4/1856 | | Opening of Service | MIDDLEBOROUGH AND TAUNTON RAILROAD opened, Middleboro to Middleboro Junction, about 8 miles. |
| | 7/15/1857 | | Opening of Service | New York & New Haven Railroad moves into new joint New Haven/Harlem New York passenger station at 4th Avenue & |
| | 27th Street and abandons old station at Canal Street; new station occupied block between 26th & 27th Streets with NY&H |
| | on one side and NY&NH on other. |
| | 7/1/1860 | | Opening of Service | NEW HAVEN & NORTHAMPTON COMPANY commenced operating lines of FARMINGTON VALLEY RAILROAD |
| | and HAMPSHIRE & HAMPDEN RAILROAD itself, hiring cars from the NEW YORK & NEW HAVEN. |
| | 7/1/1861 | | Acquisition | FAIRHAVEN BRANCH RAILROAD COMPANY deeded to NEW BEDFORD & TAUNTON RAILROAD |
| | 7/1/1862 | | Merger | NEW HAVEN & NORTHAMPTON COMPANY and the HAMPSHIRE & HAMPDEN RAILROAD CORPORATION |
| | united under name of NEW HAVEN & NORTHAMPTON COMPANY. |
| | 7/2/1862 | | Merger | FALL RIVER & WARREN RAILROAD COMPANY united with WARREN & FALL RIVER RAILROAD COMPANY |
| | under name of FALL RIVER, WARREN & PROVIDENCE RAILROAD COMPANY. |
| | 7/3/1863 | | Milestone | ROCKVILLE BRANCH RAILROAD COMPANY name changed to THE ROCKVILLE RAILROAD COMPANY. |
| | 7/1/1864 | | Incorporation | NEW YORK, HOUSATONIC & NORTHERN RAILROAD COMPANY authorized by Connecticut to construct a railroad |
| | In Connecticut from the New York line to Brookfield. |
| | 7/9/1864 | | Incorporation | NEW HAVEN & DERBY RAILROAD COMPANY incorporated in Connecticut with authority to construct a railroad from |
| | New Haven to Ansonia, 13 miles. (Company organized April 24, 1867.) |
| | 7/1/1866 | | Opening of Service | AGRICULTURAL BRANCH RAILROAD opened, Northboro to Pratts Junction, about 14 miles. |
| | 7/30/1866 | | Incorporation | NEW CANAAN RAILROAD COMPANY incorporated in Connecticut. Constructed a railroad from Stamford to New |
| | Canaan, 8.3 miles. |
| | 7/24/1867 | | Incorporation | NEW HAVEN, MIDDLETOWN & WILLIMANTIC RAILROAD COMPANY incorporated In Connecticut with authority |
| | to construct a railroad from New Haven to Willimantic, 50 miles. (Company organized October 24, 1868.) |
| | 7/4/1868 | | Opening of Service | NEW CANAAN RAILROAD opened, Stamford to New Canaan. |
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