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The Baltimore and Ohio Railroad also known as B&O (reporting mark BO) was the first common carrier and Class I railroad in the U.S. as well as one of the oldest. During its peak years, the railroad extended as far east as Staten Island New York and as far west as Illinois. Most surviving trackage is currently operated by CSX Transportation; trackage on Staten Island is operated by the Staten Island Railway as a branch of the New York City Transit Authority.