See Pictures.  Untested.  Selling as is for parts or repair since i can't test it. 

The Vintage GILBERT American Flyer Pike-MASTER Toy transformer power pack #19508 is a black power supply unit designed for model railroads and trains. Made by American Flyer, this S gauge transformer is a classic piece that would be a valuable addition to any toy train collection. With its durable construction and historical significance, this power pack is sure to bring joy to collectors and enthusiasts alike.