The Z21 is an application for controlling a digital train using a smartphone or tablet. It allows you to control the speed, as well as the headlights and the sound. It is used in conjunction with the Z21 Digital Center. The Z21 is compatible with both DCC decoders and Motorola decoders. The Z21 app offers an easy-to-use graphic interface for managing your digital locomotives. It also offers a library of specific locomotive photos to provide a quick overview of all digital operations. Controlling locomotives is simple with function symbols, even for beginners. With a single click, you can generate a layout of your railway system and operate your switches, signals, and modules. Finally, you may employ driver cabs to manage your locomotives from the perspective of a real train driver. Try the app now.