Class I railroads refer to the largest companies in the industry. In the United States, the Surface Transportation Board defines a Class I railroad as "having annual carrier operating revenues of $250 million or more.
In the United States, railroads are designated as Class I, Class II, or Class III, according to size criteria first established by the Interstate Commerce Commission (ICC) in 1911, and now governed by the Surface Transportation Board.
Consolidated Rail
Corporation (Conrail)
140,000-Mile Private Rail Network Delivers for America's Economy :
Class I Railroads.
BNSF.
Canadian National.
Canadian Pacific.
CSX Transportation.
Kansas City Southern.
Norfolk Southern.
Union Pacific.
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