| | New Haven Railroad Historical Events |
| | Date | | Category | | Event |
| | 12/14/1839 | | Opening of Service | The HARTFORD & NEW HAVEN RAILROAD opened from Belle Dock, New Haven to Hartford. |
| | 12/1/1842 | | Opening of Service | BERKSHIRE RAILROAD COMPANY opened for service, being operated by The Housatonic Railroad Company under |
| | perpetual lease. |
| | 12/1/1842 | | Opening of Service | HOUSATONIC RAILROAD opened New Milford to Massachusetts line, 38.9 miles. |
| | 12/9/1844 | | Opening of Service | HARTFORD & NEW HAVEN RAILROAD opened Hartford to Springfield. |
| | 12/21/1846 | | Opening of Service | FALL RIVER RAILROAD opened, South Braintree to Myricks and Central Street, Fall River, to Steamboat Wharf, about |
| | 30.5 miles. |
| | 12/1/1847 | | Opening of Service | DORCHESTER & MILTON BRANCH RAILROAD opened Neponset to Mattapan, 3.3 miles. |
| | 12/27/1848 | | Opening of Service | THE NEW YORK AND NEW HAVEN RAILROAD opened, Williams’ Bridge, New York to Mill River Junction, New |
| | Haven, Connecticut, about 62 miles, entering New York over the NEW YORK & HARLEM RAILROAD to its terminus at |
| | Canal Street, the cars being hauled by horses from 42nd Street to Canal Street. |
| | 12/28/1848 | | Milestone | THE NEW YORK & NEW HAVEN RAILROAD made a contract with George L. Schuyler, operating the Bridgeport - New |
| | York boats, to charge the same fare and pool receipts, the railroad’s percentage to be 65 and the boats’ 45. |
| | 12/1/1849 | | Opening of Service | HARTFORD, PROVIDENCE & FISHKILL RAILROAD opened Hartford to Willimantic, 31.5 miles. |
| | 12/24/1849 | | Opening of Service | STOCKBRIDGE AND PITTSFIELD RAILROAD opened from Van Deusenville to Pittsfield. (Operated by HOUSATONIC |
| | RAILROAD under perpetual lease.) |
| | 12/30/1851 | | Lease | THE NEW HAVEN & NEW LONDON RAILROAD COMPANY leased from the NEW YORK & NEW HAVEN |
| | RAILROAD land for a track from Mill River Junction to Grand Street, New Haven and trackage rights into the Chapel Street |
| | 12/1/1852 | | Opening of Service | MEDWAY BRANCH RAILROAD opened Norfolk to Medway. |
| | 12/12/1853 | | Merger | BOSTON & NEW YORK CENTRAL RAILROAD COMPANY organized by a consolidation of the MIDLAND |
| | RAILROAD COMPANY, the NORFOLK COUNTY RAILROAD COMPANY, and the SOUTHBRIDGE & |
| | BLACKSTONE RAILROAD COMPANY. |
| | 12/1/1855 | | Opening of Service | AGRICULTURAL BRANCH RAILROAD opened Framingham Center to Northborough via Marlboro, 13.2 miles. |
| | (Operated BY BOSTON & WORCESTER RAILROAD.) |
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