Place it at the very start of a commute or travel edit, before the first scene, then follow it with a reaction sound once the scene is set. For a sketch with two locations, use it again as a scene change between the station and the train interior.
關於此聲音
This is the short, bright chime played before announcements on Renfe Cercanías commuter trains in Spain, lasting just over four seconds. Its clean, rising notes feel instantly familiar and oddly comforting to regular passengers, like a small pause before the journey starts. The tune has become a shared joke online among Spanish commuters who recognise it at once.