Cab Engineer: DCC Throttle is an Android application to control model trains over WiFi by using JMRI’s Wifi Throttle.

Modern model train layouts are typically controlled by a digital command station. JMRI is a free software that is commonly used to control trains via these digital command stations.
The Cab Engineer application interfaces with your current JMRI server and provides a simple way to control your layout via a smartphone or tablet. The application supports throttles (to drive trains) and turnout controls. Trains can be selected by their DCC address or from the JMRI engine roster.