They will be soon, but first the 3 Coach 730/0 trains (meant for the Cross City line) will go onto the Euston lines in order to replace the Class 319s.
Don't want to disappoint but aventras tend to sound really quiet from the inside, as in , you barely hear the motors from inside..I'd argue however, these do seem to sound louder than the current aventras, so who knows how loud they will actually be inside hopefully they can be heard.
@WCML 730 from outside yeah, aventras generally are really quiet on the inside to a boring extend . Motor sounds imo are just the trains soul . But from the outside, these motors sound a bit louder than the rest so far