Place it at the end of a boarding sequence, after platform shots and just before the train moves, so it closes the scene and hands the edit to the departure shot that follows.
關於此聲音
This is an 11-second piece of music played as the doors close on a Taiwan High Speed Rail train, a short melodic cue that marks the end of boarding. It gives a calm, orderly feeling, like a clear signal that departure is near, without hurry or noise. The music comes from the THSRC door-closing sequence.