The story
The beginnings of the Chessie System came from cooperation between the Baltimore and Ohio Railroad (B&O) and the Chesapeake and Ohio Railway (C&O). An announcement from the New York Central (NYC) and Pennsylvania (PRR) railroads in November 1957 that they were considering combining prompted the B&O and C&O to consider a similar move. Ultimately, the financially stronger C&O took control of the B&O in December 1962, though the two railroads kept their separate identities.
The combined C&O/B&O purchased stock in the Western Maryland Railway until it was able to take full control in February 1967, bringing a third railroad into the combined entity, which in 1973 became formally known as the Chessie System after the C&O's historic cat mascot Chessie.
Chessie System was incorporated in Virginia on February 26, 1973, and it acquired the railroads on June 15.
On November 1, 1980, Chessie System merged with Seaboard Coast Line Industries to form CSX Corporation. Initially, the three Chessie System railroads continued to operate separately, even after Seaboard's six Family Lines System railroads were merged into the Seaboard System Railroad on December 29, 1982. That began to change in 1983, when the WM was merged into the B&O. The Chessie image continued to be applied to new and re-painted equipment until July 1, 1986, when CSXT introduced its own paint scheme. In April 1987, the B&O was merged into the C&O. In August 1987, C&O merged into CSX Transportation, a 1986 renaming of the Seaboard System Railroad, and the Chessie System name was retired.
From Wikipedia’s article on Chessie System, shared under CC BY-SA 4.0.3