Place it at the end of a station sequence, just before the departure shot, after a bell ding to signal boarding and before a door knocking cue for the next scene. That order keeps the journey moving from platform to train without repeating the same doorway moment twice.
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This six-second clip captures the Singapore MRT doors-closing sequence, with its warning chime and automated announcement telling passengers the doors are about to shut. It feels hurried and slightly tense, like the last moment to step aboard before a train leaves, while remaining instantly familiar to regular commuters.