Earlier quoted context omitted.
The tube is ~80db (depending on line) so you're not going to hear it anyway. but, if I was mayor, I would be getting the transport police to have a word with phones on speakers.
Hum. Who should you trust, me or your own ears?
I mean it depends on the line. Old northernline == 80db.
Elizabeth line, much quieter, so you're gonna hear it more