Rail noise isn't really an issue for Caltrain - but you do have some shaking as well as some noise from the diesel engines. Thus, I expect that electrification

Rail noise isn't really an issue for Caltrain - but you do have some shaking as well as some noise from the diesel engines. Thus, I expect that electrification and using modern trainsets will create a good experience. BART on the other hand has horribly loud screeching noises because of its idiosyncratic design choices.