A Class 1 railroad is defined as any railroad with annual revenue of more than $504,803,294 (the 1992 threshold of $250 million, set by the ICC, adjusted for inflation). There are six Class 1 Railroads operating in the United States; BNSF, CSX, CN, CPKC, NS and UP. Burlington Northern was formed through the mergers of Great Northern and Northern Pacific in 1970, and then merged with ATSF in 1996 to form BNSF.

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