lol (sadly)
Finger board train indicators.
I'm old enough to remember these being installed new at Guildford!
In 1983 I remember seeing them at Woking, but Guildford didn't have them. Later in 1983 or possibly in 1984 they started appearing there.
Can't remember exactly when I last saw one, but my last definite memory of one is at Clapham Junction in 1988 involving the newly extended electric services beyond Bournemouth.
I know they had gone by the mid-90s when the coloured-text TV screen type indicators for calling patterns were dominant (using BBC Micros??? or is that an urban legend?)
Talking of which, you don't see even those on stations these days. Romsey hung on to a variant until recently.
Gas lights.
Red paraffin lamps on buffer stops.
Classic BR-era lighting, such as the fluorescent strip-lights, or tungsten bulb lighting.
Even the later style (introduced in the 80s) of pinkish-orange sodium lights, which were dominant in the 90s and 00s, are becoming rare now.
Locos parked in a bay platform ready to be deployed to rescue failed trains.
Bells which ring 1 or 2 mins before a train is due to arrive. Haslemere had them in the 80s, it was one bell for one direction and two bells for the other (can't remember which was which, though).