Stock Photo - A worker opens up a switch for demonstration purposes at the centrail station in Frankfurt/Main, Germany, 7 September 2017. Many switches of the train station are controlled by the digital analysis system 'Diana' of the Deutsche Bahn railway company. The computer is said to detect possible disturbances of a switch early. Photo: Boris Roessler/dpa. - Frankfurt_Main/Hesse/Germany

Stock Photo: A worker opens up a switch for demonstration purposes at the centrail station in Frankfurt/Main, Germany, 7 September 2017.

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