The Interchange series contains articles about railroads that interchanged with the Pennsy, including fleet statistics and paint schemes with era-appropriateness guidance. A few noteworthy or pertinent freelance model railroads are included.
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The Baltimore and Ohio Railroad (reporting marks B&O, BO) is the oldest railroad in the United States and the first common carrier railroad, with its first section opening in 1830. The Chesapeake and Ohio Railway took financial control of the B&O in 1963. The B&O already had a controlling interest in the Western Maryland Railway. In 1973 the three railroads were brought together under one corporate identity, the Chessie System, although they continued to operate as separate railroads. The Western Maryland was merged into the B&O in 1976. In 1980 the Chessie System and Seaboard Coast Line Industries, a holding company that owned the Seaboard Coast Line, the Louisville & Nashville, the Clinchfield, and the Georgia Railroad, agreed to form CSX Corporation. SCL Industries was renamed the Seaboard System Railroad (SBD) in 1983, the same year that the Western Maryland Railway was completely absorbed into the B&O. SBD was renamed CSX Transportation (CSX) in 1986. On April 30, 1987, the B&O's corporate existence ended when it was absorbed into the Chesapeake & Ohio Railway, which merged into CSX Transportation on August 31 of that year.
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The Reading Company was a company that was involved in the railroad industry in southeast Pennsylvania and neighboring states from 1924 until 1976.
Commonly called the Reading Railroad and logotyped as Reading Lines, the Reading Company was a railroad holding company for the majority of its existence and was a (single) railroad during its later years. It was a successor to the Philadelphia and Reading Railway Company founded in 1833. Until the decline in anthracite loadings in the Coal Region after World War II, it was one of the most prosperous corporations in the United States.
Competition with the modern trucking industry that used the Interstate highway system for short distance transportation of goods, also known as short hauls, compounded the company's problems, forcing it into bankruptcy in the 1970s. Its railroad operations were merged into Conrail in 1976, but the corporation lasted into 2000, disposing of valuable real estate holdings.
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The Western Maryland Railway (reporting mark WM) was an American Class I railroad (1852–1983) which operated in Maryland, West Virginia, and Pennsylvania. It was primarily a coal hauling and freight railroad, with a small passenger train operation.The Western Maryland Railway (reporting mark WM) was an American Class I railroad (1852–1983) which operated in Maryland, West Virginia, and Pennsylvania. It was primarily a coal hauling and freight railroad, with a small passenger train operation.
The WM became a property of the Chessie System holding company in 1973, although it continued independent operations until May 1975 after which time many of its lines were abandoned in favor of parallel Baltimore and Ohio Railroad lines. In 1983 it was fully merged into the Baltimore & Ohio Railroad, which later was also merged with the former Chesapeake and Ohio Railroad into the Chessie System in 1987, which is now renamed as CSX Transportation.