MK1 BG High Security EoT lights or not?

[DenbyModeller]

I have recently got into modelling the late 80's and early 90's when i saw a photo of Bachmann's MK1 BG High security in RES livery when i noticed what looked to be tail light on the ends ( I have circled these in a photo.).

In real life are they actual EoT lights or not and if so how would they be operated i.e; power and control from the loco, power from the coach but control from the loco, or full indipendent power and control from the coach?

 

[Wickham Green too]

Power must come from the coach so the lights stay on in the - unlikely - event of the train becoming divided.

No, I've never noticed these before either ! 🙃

[298]

The Super BGs retained dynamos and batteries, and I'm sure I've seen an interior photo somewhere with the switches in the guards compartment.

 

There are a few videos on YouTube that would indicate that they were actually used and not substituted with a normal taillight, but I'm sure that wasn't always the case as the set (and one with a PCV) that I modelled had separate battery ones.