THSRC is Taiwan's high-speed railway, running between Taipei and Kaohsiung, and its trains play a short musical warning before the doors close. The chime is part of the everyday boarding routine for passengers, heard on platforms and inside carriages alike. Outside Taiwan, the sound has circulated through travel vlogs, train-spotting clips and soundboard uploads, where listeners recognise it as a distinctly Taiwanese rail sound. It remains popular because it is instantly recognisable, gentle rather than alarming, and easy to drop into edits about trains, travel and departures.