They had support problems. They replaced the support and footers. AFAIK it's the loop support and the one after it with the most issues. If the issues were serious they'd modify the footer and support, not scrap the thing. I doubt onboard audio. Not needed and why make the trains even heavier if you have concerns? Plus I doubt Towers will want to mod trains again since the Galactica fiasco. Considering they were roughly the same era, not massively surprising (Oblivion's theme was 97/98 whilst self titled was released '99) Blame Sid and Craig.