Seaboard System

Company History: The Seaboard System Railroad, Inc. (reporting mark SBD) was a short-lived former US Class I railroad that was created after the consolidation of the Family Lines System railroads (notably the Louisville & Nashville, Seaboard Coast Line, and Clinchfield) on December 29, 1982. Under the Family Lines era, the railroads shared common ownership but used different names when conducting business. On July 1, 1986, the Seaboard System renamed itself as the CSX Transportation and absorbed the Chesapeake & Ohio Railway on August 31, 1987 which ended the CSX Corporation's shared ownership of the Seaboard System and Chessie System railroads.

Successor/Parent History: CSX Transportation (reporting mark CSXT) is a Class I railroad in the United States. The main subsidiary of the CSX Corporation, the railroad is headquartered in Jacksonville, Florida, and owns about 21,000 route miles (34,000 km). CSX operates one of the three Class I railroads serving most of the East Coast, the other two being the Norfolk Southern Railway (NS) and Canadian Pacific Railway. It also serves the Canadian provinces of Ontario and Quebec. Together CSX and Norfolk Southern Railway have a duopoly over all east-west freight rail traffic east of the Mississippi River. As of October 1, 2014 CSX's total public stock value was slightly over $32 billion.

CSX Transportation was formed on November 1, 1980, by combining the railroads of the former Chessie System with Seaboard Coast Line Industries, and finally with the Seaboard System Railroad in 1986. The originator of the Seaboard System was the former Seaboard Air Line Railroad, which previously merged with the Atlantic Coast Line Railroad in 1967, and later with the Louisville & Nashville Railroad, as well as several smaller subsidiaries such as the Clinchfield Railroad, Atlanta & West Point Railroad, Monon Railroad and the Georgia Railroad. The origin of the Chessie System was the former Chesapeake & Ohio Railway, which had merged with the Baltimore & Ohio Railroad, and the Western Maryland Railway.

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