Many years ago when I went train watching at Guide Bridge, the imminent arrival of *some* passenger trains was announced by a loud electric bell somewhere on the station. I suppose it was to summon staff from the bar( I mean refreshment room) on platform 4 to attend to luggage, door closing and the like. I don't expect Guide Bridge was unique with its bell, but my question is: who was responsible for sounding it? the nearest signal box? The stationmaster? Railway Control in some distant office?Does it still happen anywhere,perhaps on a preserved line?