Our Answer: An overhead line bicycle, also known as a conductor inspection trolley or running board, is a specialized piece of equipment used by line workers to travel along energized or de-energized overhead conductors. Its primary function is to facilitate the inspection, maintenance, and installation of various accessories, such as vibration dampers or anti-galloping devices, on power lines in areas that are difficult to access with traditional vehicles, like over rivers, ravines, or mountainous terrain.