WT-Class 42 Warship (Wheeltappers) 

F0 Lights On/Off.

F1 Sound On/Off.  

F2 Two Tone Horn (High-Low)

F3 Two Tone Horn (Low-High)

F4 Single Horn

F5 Buffer Clash

F6 Coupling/Uncoupling

F7 Flange Squeel

F8 Spirax Valves

F9 Wheel Slip

F10 Door Slams

F11 Right Away Whistle

F12 Brake Dump

F13 Shunting Mode/Slow Speed

F14 Not Used.

F15 Aux 1