This Lionel Vintage No 81 Rheostat is a great addition to any train collector's inventory. Made of pressed steel and in a classic black color, this ready-to-go, pre-built unit operates on AC power and uses an analog control system. It is perfect for those aged 17 years and up, and was manufactured in the United States with a gauge of O. This unit comes in a unit quantity of 1 and is sure to please any train enthusiast.