In a modern, comfortable and customer-friendly transportation system it is possible for customers to move from A to B in a comfortable way and within a reasonable amount of time. To fulfil such requirements, it is necessary to permanently monitor the conditions of both the track system and the rail vehicles. Nowadays for both there are plenty of autonomous inspection-systems. But the railway system has to be considered as a whole, as the interaction of rail and wheel is the system’s link when dealing with the dynamic behaviour of a railway vehicle, which at last is responsible for all necessary maintenance tasks. Thus maintenance strategies for rail infrastructure and rail vehicles should be discussed jointly, but for the lack of a suitable measuring system that’s not possible yet.