Tonne-kilometre (tkm) carried by rail

Unit of measurement of goods transport that represents the transport of one tonne of goods over a distance of one kilometre. If not otherwise stated, the weight to be considered is the gross-gross weight of goods (see A.V-17). The distance to be covered is the distance actually travelled on the relevant network. To avoid double counting, each country should count only the tkm performed on its territory. If this is not available, then the distance charged or estimated should be taken into account. Also referred to as ‘net tonne-kilometre carried by a wagon’, consistent with the notion of net weight of goods carried by a wagon (see A.V-19)