Below is a list of the Function keys and their assignments applicable to this model.
F0. Lights on /off
F1. Sound on/off
F2. Playable horn, two tone (1)
F3. Playable horn, two tone (2)
F4. Playable horn
F6. Playable siren
F7. APU motor
F8. Water cannon motor and spray sounds
F9. Flange squeal
F10. Double horn mix
F11. Spyrex air valve ‘tick’
F12. Shunt mode, Press once the loco goes half speed, press it again and you are back to normal control.
F13. Acceleration/Deceleration speed over ride.
F14. Aux 1
F15. Aux 2