Put it near the end of a travel sequence, after the station platform shots and just before the departure scene, then follow a missed connection with Dun Dun Dun, or lead into it with Bell Ding to mark the final boarding call.
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This 12-second clip captures a Hong Kong MTR train door closing, with its repeating warning tones and the heavy slide of the doors as they shut. It feels urgent and a little tense, like the last moment to step aboard before the train leaves. The recording comes from Hong Kong's MTR, giving it an authentic commuter atmosphere for city and travel scenes.