Here is a video I found on You Tube, from the city of Dayton Ohio USA.
In this winter night time video, an electric trolleybus from the Miami Valley Regional Transportation Authority, is viewed cutting ice off of the overhead trolley wires which are energized at 600 volts DC.
This was a very spectacular image I remember from my own childhood growing up in Chicago during the 1960's, when the Chicago Transit Authority was still using electric trolleybuses on some of the former electric streetcar routes.
Ice would often form on the overhead twin trolleybus wires, often requiring a good scraping during the cold wet winter season. This was one of the main reasons that trolleybuses were eventually phased out by Chicago's CTA in 1973.