Ton-Mile 1 : (1) A unit used in comparing freight earnings or expenses. The amount earned from the cost of hauling a ton of freight one mile. (2) The movement of a ton of freight one mile
US Department of Transportation, Maritime Administration, Glossary of Shipping Terms, Washington, DC, USA 2008. http://www.marad.dot.gov/documents/Glossary_final. pdf, (Mrtm - Amer) {572}