From BART FAQ on new cars:

"Q: Will the new cars be less noisy?

A: Yes, BART is requiring the carbuilder to meet the highest standards in the United States regarding train car interior noise and noise absorption. To achieve this requirement, the new cars will have plug style doors that better seal out the noise.

BART is also working on ways to make the tracks quieter. BART recently bought new track maintenance equipment to improve the condition of the track and reduce the screeching noise heard by riders and neighbors. BART has conducted a number of experiments with different wheel metals and sound dampeners, but has found track maintenance to be the most effective solution so far."

Sounds to me regrettably like the same blindered, old hubris-addled BART of 1966.