Track sections consist of a one-piece streamlined 18-gauge zinc coated steel housing and the enclosed current carrying bus bars and insulators, all factory assembled in convenient lengths ready for easy, fool-proof installation on the job. No special tools required. The lower portion of the housing serve as smooth, rigid runways for the trolleys. Track rating: 60 amperes (continuous), 90 amperes (intermittent). 10' and 5' are standard lengths. Other lengths furnished on special order.