Abstract: The present invention is a method and a device for tracking the unloading and loading of containers from and onto carrying platforms of tracks, using unloading and loading motion activity time course patterns characteristic of a specific container in combination with a specific carrying platform of a truck. In the invention the device is connected to a specific container and records the tilting angle of the container in the time course of unloading and/or loading from and onto a specific platform of the truck. A digital data processor produces from the data a motion activity time course pattern curve which is compared and matched for fitness to a predetermined standard motion activity time course pattern curve for the specific container and specific carrying platform of a truck and sends the degree of fitness to a data receiving terminal system.