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You'd think. But efforts long underway to incrementally improve the SD-LA section are now caught in a deep mire of NIMBYism:

https://www.trains.com/trn/news-reviews/news-wire/new-study-...

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These people are objecting to…a train running under them? Why?

Depending on the depth of the tunnel and the construction of the structure, you can get vibrations through the ground and foundations of the structure transmitted such that they are noticeable.

e.g. If you live above a tube line in London (London Underground) then you may hear/feel rumbling every time a train passes under you.

Because of disruption during drilling, apparently, but mostly because they’re rich and can complain.

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