Below is a list of the Function keys and their assignments applicable to this model. F0. Lights on/off (if fitted) F1. Sound on/off F2. Long whistle F3. Short whistle F4. Buffer up F5. Coupling up F6. Injectors F7. Drain cocks F8. Safety valve F9. Guards whistle F10. Carriage door slam F11. Wheel/track ‘groan’ F12. Shunt mode – half speed F13. Accel/Decel override F14. Aux 1 F15. Aux 2