Reading that page, you'll notice the following:
CityRail entered the digital announcement era with the introduction of "Amiga". This basic code driven system which received its sound files from the then cartridge tape announcement system, made its way across the suburbs of Sydney. Characteristics of Amiga were its higher chime and a more 'cut and paste' sound than the replacement DVA. In the first half of 2000 the few remaining Amiga stations such as Penshurst and Belmore received their more modern version of digital announcements sadly bringing Amiga's days to a close.
Which is a shame, since I live in Chatswood and was about to run down to the station to check it out...
Regards,
Yttrium Oxide
AKA Ben de Waal
(posting from Mozilla 1.4b on an AmigaOne G3XE)