I was travelling by train on 5-Nov-2018 evening rush hour, standing near the in-train automatic doors that separate carriages. The doors have sensors and open when someone comes close to them, because the train was very full the doors remained open most of the time. However, now and then they would spontaneously close, only to open again a few seconds later.
When closing, the doors made a horrible metallic squeak. However, this only happened during closing. When opening there was no unusual noise.
I managed to make a recording using my Samsung Galaxy 3 mobile phone. Converted to wav using Audacity on my PC.
around 7s, someone coughs
around 22s squeaks
around 42s beeps, doors open, in-train announcement, beeps, doors close
1m13s the inside train doors between carriages close with a loud squeak
Type
Wave (.wav)
Duration
1:21.502
File size
6.9 MB
Sample rate
44100.0 Hz
Bit depth
16 bit
Channels
Mono
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