Ton Mile 1 : A measurement used in the economics of transportation to designate one ton being moved one mile. This is useful to the shipper because it includes the distance to move a commodity in the calculation
Ports and Ships: Port news and Shipping Movements in African and, Glossary of maritime terms, Durban, South Africa 2012. http://ports.co.za/maritime-terms.php, (Mrtm/ Ports and Ships - Brit) {538}