Vintage Thunder Line Power Pack by Associated Hobby Manufacturers (AHM), model 7020, designed for HO scale model railroads. This hobby transformer features a yellow metal housing with classic graphics, providing controls for direction and speed (Slow to Fast). It includes terminals for both accessories and trains, with technical specifications including 120 VAC 60 Hz input and 16.5 VDC / 17.5 VAC output. Made in the USA, this unit is a functional piece of model railroading history. Tested in working condition.