This is a generic warning sound rather than a clip from a film, song or viral meme. Railway crossing bells are used at level crossings around the world to warn drivers and pedestrians that a train is approaching, and the same sharp, repeating tone has long been reused in film, television and video games to signal a train, a journey or an imminent arrival. Because the sound is instantly recognisable even without any picture, editors and sound designers continue to use it as a quick audio shorthand for trains, travel and waiting at a barrier.