F0 Lights On / Off (New Fade on/Fade off feature enabled)

F1 Engine On / Off / Multistart with sound fade in / out

F2 Playable High Horn

F3 Playable Low Horn

F4 Buffering Up (when moving slowly) / Coupling Hook (when stationary)

F5 Playable Brake Application (when moving) / Brake Dump (when stationary)

F6 Driver's Door Slam

F7 Compressor

F8 Drive Hold (DriveLock)

F9 Variable Speed Flange Squeal

F10 Despatch Whistle

F11 Guards Right Away Bell  & Optional reply Buzzer

F12 Radiator Fan

F13 Not Used

F14 Exhauster (Two Speed)

F15 Spirax Valves

F16 Not Used

F17 Not Used

F18 Track Detonators (Speed Dependant 3 bang stop)

F19 Push-Pull mode at No1 End (When used with 4TC Unit)

F20 Push-Pull mode at No2 End (When used with 4TC Unit)