|Class I||Non-Class I||Total|
|Number of railroads||8||7||552||568||560||575|
|Freight revenue (billions of current dollars)||33.1||67.6||3.2||4.0||36.3||71.6|
|Operating revenue (billions of current dollars)||34.1||69.9||NA||NA||NA||NA|
KEY: NA = not available.
NOTES: Class I railroads have annual carrier operating revenue of $467.1 million or more. Numbers may not add to totals due to rounding.
SOURCE: Association of American Railroads, Railroad Facts (Washington, DC: annual issues), p. 3.