An device and attendant method for interfacing with a locomotive engine. An illustrative embodiment of the device includes at least one sensor disposed in a sensing relationship with a relay bank of the locomotive engine. The sensor is structured for determination of a state of the relay bank. The sensor is further structured to determine a corresponding throttle notch position of the locomotive engine from the state of the relay bank. The device also includes at least one indicator in a communicating relationship with said one sensor. The indicator is structured to indicate the corresponding throttle notch position. The present invention further relates to a method for interfacing with a locomotive engine.