The Xtrapolis 100 is a type of electric train used on Melbourne's suburban rail network in Australia, where onboard announcements keep passengers informed about services that are not stopping or carrying people. Short recordings of these announcements are shared by rail enthusiasts and creators who want an authentic Australian transport sound, rather than a generic train effect. Because the wording is specific and immediately recognisable to Melbourne commuters, the clip still works as a quick joke or scene-setter in travel videos, train-spotting edits and social posts about public transport.