Google "railway earth shake"Because unless you see the train coming, you are dead.
Or "railway noise and vibration"
Or" train vibration issues"
Or "railway induced ground vibration"
All studies done on this topic are not to determine if there is noise and vibration. That's a given. Purpose is to mitigate damage and complaints. I read a few which were very boring. They also do them to determine distance hospitals should be from tracks as train vibration is found out to be detrimental to heart rate and health.
Google "train vibration on heart health"
Many studies to read. 1 concluded"freight trains provoke HR accelerations during sleep, and the VIBRATION characteristics of the trains are of special importance. In the long term, this may affect cardiovascular functioning"
The noise and vibration caused by trains are not only real but it is an issue. Noise and what is referred to as "ground shake" is much worse the closer you are to the track and yes the ground does shake. Anyway, i don't expect you to read stuff you wont agree with but its there if you want to learn.
To summarize, trains are not silent and they do create ground vibrations.
Freight trains are measured at ;
76 vdb at 200 ft.
82 vdb at 100 ft.
88 vdb at 50 ft.
Perception at 65 vdb and annoyance starts at 70. Above info from Southwest's "vibration fact sheet". This is a railways data so you can probably add a few vdb.
Fyi. The link u had in 1 of your above posts from "popular science" was a puff piece. You should have figured that out.