SRANSW XPT (2000-2018)
Paxman 12VP185 prime movers (one decoder per power unit)
F0        Headlight 
F1        Prime-movers start-up & shut-down
F2        City horn
F3        Country horn
F4        Guard’s whistle
F5        Drive hold (FT)
F6        Brake application (FT)
F7        Service mode
F8        Air handbrake
F9        Mixed horn
F10      Curve squeal
F11      White markers 
F12      Red markers
F13      Ditchlights
F14      Announcement 
F15      Headlight dimmer
* Suits original 2015 production run