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. BNSF is one of the largest freight railroads in the country with over 32,000 miles of rail, and was formed through the mergers of Burlington Northern and ATSF in 1995.

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