Place this clip at the transition out of a station scene, just before your next location appears on screen. Follow it with quiet travel footage or a low background track underneath the following shot, and keep any reaction sounds for after the doors have fully closed in the edit.
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This clip captures an SMRT train door closing sequence, about six seconds of the warning chime and spoken announcement heard before the doors shut. It feels oddly urgent and nostalgic at once, instantly putting regular commuters on alert. It comes from Singapore's SMRT metro trains, where the cue plays in stations and carriages before departure.