Connecticut Southern Railroad
|Locale||Connecticut, United States|
|Dates of operation||1996–present|
|Track gauge||4 ft 8 1⁄2 in (1,435 mm) standard gauge|
|Length||78 miles (126 km)|
The Connecticut Southern Railroad (reporting mark CSOR) is a 78-mile (126 km) long short-line railroad  operating in Connecticut and Massachusetts, on lines originally operated by the New York, New Haven and Hartford Railroad, later operated by Penn Central and Conrail. It is a subsidiary of Genesee & Wyoming. The line is headquartered in Hartford, Connecticut and interchanges with CSX at West Springfield, Massachusetts and New Haven, Connecticut. Pan Am Railways exercises trackage rights to access its line at Berlin, Connecticut connecting to Waterbury, Connecticut.
The railroad began operations in 1996 and was acquired by RailAmerica in 2000. Genesee & Wyoming acquired the railroad as part of its acquisition of RailAmerica in 2012.
- "Genesee & Wyoming-CSO". Retrieved 2013-05-02.
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