| | New Haven Railroad Historical Events |
| | Date | | Category | | Event |
| | 1/26/1848 | | Opening of Service | Cape Cod Branch Railroad opened, Middleborough to Wareham, MA. |
| | 1/26/1848 | | Opening of Service | CAPE COD BRANCH RAILROAD opened Middleborough to Wareham, 14.7 miles. |
| | 1/31/1848 | | Opening of Service | Cape Cod Branch Railroad opened, Wareham to Agawam (East Wareham), MA. |
| | 1/1/1849 | | Opening of Service | SOUTH SHORE RAILROAD, opened from Braintree to Cohasset. |
| | 1/14/1850 | | Opening of Service | NEW HAVEN AND NORTHAMPTON RAILROAD opened, Plainville to Granby, Connecticut, about 19.5 miles. Opened |
| | to Simsbury. |
| | 1/14/1850 | | Opening of Service | NEW HAVEN AND NORTHAMPTON RAILROAD opened, Simsbury to Tariffville, about 1 mile. Discontinued 1869. |
| | 1/1/1852 | | Milestone | EAST THOMPSON RAILROAD COMPANY charter expired. |
| | 1/1/1852 | | Opening of Service | New Haven & New London Railroad opens; hampered by lack of an eastward connection at New London. |
| | 1/1/1853 | | Merger | WOONSOCKET UNION RAILROAD COMPANY united with THE NEW YORK & BOSTON RAILROAD COMPANY |
| | under name of latter company. |
| | 1/1/1853 | | Opening of Service | PROVIDENCE & WORCESTER RAILROAD opened, South Worcester to Green Street, Worcester. |
| | 1/1/1853 | | Opening of Service | SOUTHBRIDGE & BLACKSTONE RAILROAD constructed a branch from East Thompson to Mechanicsville (north of |
| | Putnam) where it connected with the Norwich & Worcester and where it hoped to connect with the New York & Boston. |
| | 1/1/1853 | | Milestone | BOSTON & PROVIDENCE RAILROAD & TRANSPORTATION COMPANY name changed to BOSTON & |
| | PROVIDENCE RAILROAD CORPORATION (OF RHODE ISLAND). |
| | 1/1/1855 | | Opening of Service | NORWICH AND WORCESTER RAILROAD opened, Norwich, Market Street, to NEW LONDON NORTHERN |
| | RAILROAD connecting track. |
| | 1/1/1855 | | Opening of Service | BOSTON & NEW YORK CENTRAL RAILROAD opened line Boston to South Dedham (originally authorized by charter |
| | of the MIDLAND RAILROAD) where it connected with its own road, formerly the NORFOLK COUNTY RAILROAD |
| | COMPANY and thus a through line was established from Boston to New York via the NORWICH & WORCESTER |
| | RAILROAD and its connecting boat line, the NORWICH & NEW YORK TRANSPORTATION COMPANY. |
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