I've been travelling recently and at multiple stations there have been speakers emitting a bleep every second. (For example Stansted Airports station).

Is there a reason for this?

  • 3
    Sound markings for the blind?
    – Janka
    Jun 16, 2019 at 0:27
  • Do you have a recording? I can't think what this would be.
    – Muzer
    Jun 17, 2019 at 13:29
  • Might have found one myself - is it the very faint beep every second you hear at this point in this video? youtu.be/gRu9_OWfr-g?t=102 I definitely can't think what that would be, besides perhaps interference in some speaker system from a mechanical clock, as @anon suggested.
    – Muzer
    Jun 17, 2019 at 14:15
  • @Muzer yep that is it faintly in that video. I'll record it next time I'm there regardless.
    – Cjen1
    Jun 19, 2019 at 0:36

1 Answer 1


Is the bleep louder every 10 seconds, even louder every minute, even louder every 10 minutes, even louder every hour, and loudest at 10:00:00, 20:00:00, and 00:00:00? If so, it might be the mechanism of the station clocks. Many of the older clocks with digital display make a clicking sound every second as one or more of the six figures changes.

  • We thought it might be that but the sounds were coming from a speaker rather than the clock. Additionally they were all the same loudness. Good idea though.
    – Cjen1
    Jun 17, 2019 at 11:29
  • 1
    Based on the video I found, I suspect this is in fact the answer - some mechanical clock system was perhaps inducing stray current in some dodgy speaker cabling somewhere, thus resulting in this noise. I could be wrong though, it's a very weird sound, and this is just a guess. I certainly can't think of any other purpose.
    – Muzer
    Jun 17, 2019 at 14:16

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