Line tensioning in Germany Catenary wires are kept in mechanical stress as the pantograph leads to mechanical oscillations while in the wire.請更新您的瀏覽�?您使用的瀏覽器版本較舊，已不再受支援。建議您更新瀏覽器版本，以獲得最佳使用體驗。Inside the Soviet Union the subsequent different types of wires/
b : a slender crease (as to the experience) : wrinkle c : the class or way of anything in motion : route the road of flight of the bulletThrough cold or frosty weather, ice may possibly coat overhead lines. This may end up in poor electrical contact involving the collector and also the overhead line, resulting in electrical arcing and power surges.