Below is a list of the Function keys and their assignments applicable to this model.
F1. Sound on/off
F2. Long whistle/hooter (press once and it will sound until pressed again)
F3. Short whistle/hooter
F4. Buffering up
F5. Coupling up
F7. Drain cocks
F8. Buffer clash on wagons
F9. Accelleration/Decelleration over ride. Press once to over ride, press again to return to preset settings.
F10. Shunting mode. Press once the loco goes slowly, press it again and you are back to normal control.