12RailKing 6-8-6 Steam Turbine EngineProto-Coupler® OperationThis locomotive is equipped with a coil-wound Proto-Coupler for remoteuncoupling action. Because the Proto-Coupler is controlled through theProto-Sound 2.0 microprocessor, it does not require an uncoupling tracksection or modification to your layout to function. Use the code listed below tofire the coupler.Rear Coupler:To fire the rear coupler, press the Bell button once followed immediately bythree pushes of the Whistle button. The sound of the liftbar and air linedepletion will play, and the knuckle will be released.Speed Control:M.T.H. engines equipped with Proto-Sound 2.0 have speed control capabilitiesthat allow the engine to maintain a constant speed up and down grades andaround curves, much like an automobile cruise control. You can add or dropcars on the run, and the engine will maintain the speed you set.While the engine is programmed to start with the speed control featureactivated, you can opt to turn it off. This means the engine’s speed will fall asit labors up a hill and increase as it travels downward. It is also affected by theaddition or releasing of cars while on the run. To maintain a constant speedwhen speed control is turned off, you need to adjust track voltage yourself.When speed control is off, the volume will drop to allow for better low voltageoperation. Full volume is restored upon reactivation of speed control.To turn speed control on and off, put the engine in neutral, then press thetransformer’s Whistle button one time then immediately press the Bell buttontwo times. Two horn blasts will indicate that the engine has made the change.Repeat the 1 whistle, 2 bells code to return it to the other state. You will wantto do this during the initial neutral upon start-up if you ever couple thisengine to another engine that is not equipped with speed control to avoiddamaging the motors in either engine. Each time you shut down the enginecompletely, it will automatically turn speed control on.