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Here is a photo of the front of a train: <a href="http://hellertal.startbilder.de/1200/der-wsw-gtw-72-dreiteiliger-479954.jpg">http://hellertal.startbilder.de/1200/der-wsw-gtw-72-dreiteiliger-479954.jpg</a> The energy supply is a 2nd rail. In the photo it is directly beside the running rail. You can see the insulator. Originally the 2nd rail carried 600 VDC. With the latest train generation it was increased to 750 VDC. The running rail is also the return conductor. Here is a photo of a switch/turnout showing running rail and 2nd rail as section: <a href="https://www.golocal.de/wuppertal/stadtverwaltung/stadt-wuppertal-rathaus-stadtteile-YUtXh/fotos/?p=18">https://www.golocal.de/wuppertal/stadtverwaltung/stadt-wuppertal-rathaus-stadtteile-YUtXh/fotos/?p=18</a> I hope that helps. Regards, Volker
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