This interesting photo is from the Trolleybus Facebook page. The origin is a Russian transit group.
http://transphoto.ru/
When you first look at this photo, it is hard to see where the flames are coming from. How do you get the wire to heat up several centimeters from the trolley shoes? Looking again you will see two burners, with a gas supply attached to the trolleypoles by what looks to be tape. How resourceful!
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