Below is a list of the Function keys and their assignments applicable to this model. F0. Lights on/off where fitted F1. Sound on/off F2. Whistle long F3. Whistle short F4. Buffering up F5. Coupling up F6. Injectors F7. Drain cocks F8. Safety valve F9. Sleeper groan F10. Guards whistle F11. Carriage door slam F12. Shunt mode (Half speed running) F13. Accel/ Decel override F14. Aux 1 F15. Aux 2