The Western Maryland Railway (AAR reporting marks WM) was an American Class I railroad which operated in Maryland, West Virginia and Pennsylvania. It was built west from Baltimore in 1852 and completed to Hagerstown, Maryland in 1872 finally becoming the Western Maryland Railway Company. The coal and lumber trades made important freight for the WM and it's fast freight service ran from West Virginia through to Pennsylvania. In 1964, the Chesapeake and Ohio Railway (C&O) and the Baltimore and Ohio Railroad (B&O) jointly filed for permission to acquire control of the Western Maryland Railway with the Interstate Commerce Commission (ICC). In 1973, as part of the Chessie System, the Western Maryland ownership went to C&O and it was operated by the B&O. In 1987, it was merged into the C&O which itself became part of CSX Transportation.
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