The MTH 40-750 Z-750 Transformer is a 75W AC power source designed for model railroads and trains. It features whistle bell and direction controls, making it easy to operate and customize your train layout. With the option to control your train remotely, you can enjoy a more interactive and immersive model railroading experience. This transformer is a reliable and powerful accessory for any model railroad enthusiast looking to enhance their collection. both were from a lot. They are untested and I’m not sure if they work so selling as parts but could very well work don’t know if all the stuff goes together if it’s all separate but selling in one lot.