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| | 120 V; 60 Hz vs. 240 V; 50 Hz - ECN Electrical Forum |
 | | Vienna alone has 650V (not sure, maybe the Trams are 750, not 650), 750V catenary, 750V third rail, 950V (all DC) and 15kV 16 2/3 Hz AC. |
 | | The Vienna Stadtbahn network that was opened as an urban steam railway system with interconnected lines and trains going as far as 100 or more km out of town is now split up into 3 isolated systems. |
 | | After WWII the US Army built lots of houses for the accomodation of the soldiers, and those had either 120V only or 120 and 220V side by side, the 110V stuff usually wired with US stuff, even using standard nail-on boxes in solid plastered brick walls. |
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