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Find a Wikipedia image that answers this question: Why are there wires above the tracks outside Hauptbahnhof Zürich?

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Represent the given Wikipedia image with related text information: Hauptbahnhof Zürich - Bahnhofstrasse 2018-09-05 14-07-11 Zurich Hauptbahnhof.

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['images/WebQA/Train/30053215.jpg', 'images/WebQA/Train/30192385.jpg', 'images/WebQA/Train/30123157.jpg', 'images/WebQA/Train/30177817.jpg', 'images/WebQA/Train/30028454.jpg', 'images/WebQA/Train/30033631.jpg', 'images/WebQA/Train/30317519.jpg', 'images/WebQA/Train/30241001.jpg', 'images/WebQA/Train/30385848.jpg', 'images/WebQA/Train/30217414.jpg', 'images/WebQA/Train/30360873.jpg']