the invention concerns a system (1) for monitoring the integrity of a train (2) and / or to determine the position of the train (2).in order to monitor the integrity of any trains and their position to determine if the system (1) erfindungsgemäß an unmanned aircraft (4) with a sensor (5).with the sensor (5) is trained, positions of the train (2) and / or parts (3) of the train (2) to generate sensor data entry.
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