You have found more guidance the like of which
@Dogtrousers has helpfully shared upthread.
Good to see the hazard of lights on helmets (NB out of sight to the cyclist) specifically recognised
The text I found in that link was: "Please switch off your rear red light on your bicycle whilst you’re in a station as this can distract or confuse
the driver of the train pulling into the station."
So if a potential passenger falls (or jumps down) onto the track, is it SOP for station staff on the platform (if any) to wave a red light to alert the driver of an approaching train?
Do TOCs have a mandatory protocol/mechanism for reporting emergency stops? Are there shared data on that? So lessons can be identified, and learned if practical?