During the weekend closure of the Transbay Tube earlier this month, BART replaced some of the tracks in the tube itself that they say are responsible for the terrible screeching sound that we all hate, but have suffered through for decades on speeding trains. According to some riders interviewed by news media at the time, the screeching problem was either improved, or exactly the same after the August 1-2 repairs. But now the system will shut down between Oakland and SF once again over Labor Day weekend, and SF Mag is again touting the possibility that the screeching will end once and for all after a new set of track replacements occur.
The screeching, FYI, is "caused by the normal wear from repeated metal-on-metal contact," essentially ripples on the metal caused, "When the trains accelerate and decelerate at the same location over and over."
Therefore on new tracks you shouldn't have this problem, and the trip between Embarcadero and West Oakland stations should be notably quieter come September 8, after "the loudest stretches of track" get replaced in the tube.
This is exciting news for everyone who does not own the latest in noise-canceling headphones and can barely even hear their podcast during several minutes of their daily commute.
Furthermore, noise from the rumbling train itself will be reduced further on new cars that start rolling out next year, which are allegedly more sound-proofed around the doors.