Below is a list of the Function keys and their assignments applicable to this model. F0. Lights on/off F1. Sound on/off F2. Double Horn 1 F3. Double Horn 2 F4. Single Horn F5. Buffering up F6. Coupling up F7. Flange squeal F8. Buffer ‘clash’ on wagons F9. Carriage door slam F10. Fan F11. Buffer ‘clash’ on wagons F12. Compressor F13. Brake release F14. Seagull F15. Acceleration/deceleration F16. Switching mode F17. Aux 1