Through a loading and unloading station for load carriers of vehicle bodies, vehicles or the like, it is possible to unload vehicle bodies from a railway car in a continuous cycle and supply them to a production facility, wherein in one cycle simultaneously the load carriers receiving the vehicle bodies are returned to an empty railway car. The magnetic based, single axis sensors are on a linear or nonlinear single axis sensor assembly. According to various embodiments, the treatment process can involve a soaking step or a plasma treatment step.