Place this chime at the station beat just before a departure cut, then follow the boarding sequence with a ding sound effect for platform announcements, or stack it after a door knocking sound to build a busy carriage entry sequence in transport edits.
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This is just over three seconds of the Sydney Metro door closing chime, a clear electronic alert tone played as train doors are about to shut. It feels calm but urgent, giving listeners that split-second sense of needing to step in or step back. It comes from Sydney Metro trains in Australia, where the chime warns passengers before departure.