The installation is for HO-Scale Fleischmann 4375 BR103 . It uses T1 decoder and was performed by Ric Bogart of Osborne Park W A, Australia
This particular model as it has lots of room for the decoder and cable.Firstly disassemble the loco (as per the operating instructions for the service of the unit) Lift the locomotive casing and remove.
The pantographs have to be isolated from any circuits there is a switch that selects between pantograph and track pickup a small strip of insulating tape will do the job, the switch is then replaced with a link wire Lights must then be isolated on one side (running the existing lamps on half wave power)
Following the decoders instructions the red wire -----to the right side rail pickup orange wire -----to the motor replacing the original brown wire black wire ---- to the left side rail pickup grey wire ------to the motor replacing the black wire ------ white to the forward headlight ----- yellow to the rear headlight