If you mean body side hazard lights on the Desiros they flash when the guard is keyed in in that vehicle rather than anything to do with the doors closing.
I don't mean automated external announcements, I mean a driver controlled PA, where I can hurry people up a bit or tell people jabbing the buttons after doors close to stand back you've missed it!
To be fair, "Will the passengers intending to travel on this service please join the train now, as it's ready to leave" does create this sense of urgency, especially when you're frantically trying to find the platform in a London Terminal station.
Oh right - I shall have to keep a look out next time I see one of those going out, I've never noticed!
Having just found a video I see what you mean - I've been around these units since they were introduced and never noticed
Happened in Newcastle with a 185. Yes it has been established that the inexperienced (at least with the stock anyway but) conductor failed to despatch the train correctly. However, the fact a woman was able to become trapped in the doors with the doors closed and interlocked around her wrist is still quite comcerning. 185 doors will bounce open on the first time an obstacle is detected, but will attempt to close a second time and go for interlock. Wether this is unique to 185's or a design flaw with the desiro fleet remains to be seen, but as they passed legislation at the time of introduction, i dont think anyone is overly keen or concerned to investigate further......
The first time people hear it. Then they realise it happens a few minutes before the train goes, so next time they hear it at the doors they take it nice and easy!