Definition: Tonne-kilometre offered

Maritime transport

A tonne-kilometre is offered when one tonne of carrying capacity in a merchant ship is sailed over one kilometre. Tonne-kilometres offered are equal to the cargo carrying capacity of the vessel multiplied by the port-to-port distance for all journeys. Transport in barges is included.
Source:
Glossary For Transport Statistics, Eurostat, ECMT, UN/ECE, Third edition
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