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Where are you comparing it to? In my experience the quietest subways are from the past 20 years or so. BART first started running in ~1970.

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Well bart is famous for having super loud screeching wheels[0], but they will be replaced by around 2021..

The screeching is absolutely loud for a subway, though I think the noise all together isn't so bad relative to other subways.

[0]: https://ww2.kqed.org/news/2016/08/02/why-are-bart-trains-so-...

[1]: https://www.bart.gov/news/articles/2016/news20160831

Yes, it is awful. I've spent significant time in Japan and can't believe how quiet the trains are - including the high-speed bullet trains - compared to the awful screeching of the train I grew up riding: BART.

WellBart is about the same noise level as th Boston green line which is the oldest subway in the country.

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