Metrology Of The The Coaltrade At Liege In The 19Th Century: When they try to calculate the production of the collieries of Liège, historians use the cartload, and at that a uniform cartload of 1.800 kilos. Actually, in the first half of the past century two different kinds of carts (the "tombereau de Liège" and the "voiture de Meuse") were used. Neither of them had a uniform capacity, even if in 1844 it was decided that the former should be equal to 16 hectoliters, the latter equal to 24 hectoliters.