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Energy Intensity of Class I Railroad (a) Freight Service
The heat equivalent factor used for Btu conversion is 138,700 Btu/gallon.
KEY: Btu = British thermal unit.
a The threshold for classification as a Class I Railroads is based on operating revenues; the 2015 threshold is $457.91 million.
Association of American Railroads, Railroad Facts 2016 (Washington, DC: 2015), pp. 9, 37, 40, and 43, and similar tables in earlier editions.