What Is This 1980s London Underground Noise?

[HotAirBalloon]

At 3:52 in this piece of 1980s stock footage there's a quite loud horn noise.

I was assuming it was a "this train is ready to depart' warning but (at least in this clip) the train doesn't leave for a little bit of time later.

Warning that it may be quite loud if you're using headphones!

 

[tomuk]

At 3:52 in this piece of 1980s stock footage there's a quite loud horn noise.

I was assuming it was a "this train is ready to depart' warning but (at least in this clip) the train doesn't leave for a little bit of time later.

Warning that it may be quite loud if you're using headphones!

Is that a young Adrian Shooter? There is a certain resemblance.

 

[Peter Mugridge]

I don't ever remember the underground trains sounding anything before departing - and in any case, I'd expect a whistle rather than a horn.

Is it possible the sound has been dubbed in for some reason? Having said that... the noise does ring a bell, but I can't quite place it.

While on the subject of this clip... is that the actor Michael Brandon ( of Dempsey and Makepeace fame ) on the train?

 

[matt_world2004]

I'm guessing it might have been added on afterwards to mark where to make a cut in the footage. Such a buzzer would have been quite distinctive on a waveform machine so it is possible that when someone was marking up footage to edit the buzz was put in to show to cut there later

 

[Mojo]

At certain locations such as on the Victoria line at Walthamstow you can hear a very similar sound which is the Train Operator pressing the “Rear Cab Clear” plunger after having alighted the train but which another driver is taking out (known as stepping back).

 

[Sad Sprinter]

I'm not sure if its been edited in, it sounds like there's a bit of an echo

 

[Ex LT]

No it has not been dubbed this is at Victoria and they had an audible warning to say that the doors were about to close I seem to remember that it could be worked by staff or work automatically. There was another location which escapes me.