Indian Railways uses the WAP designation for broad gauge AC electric passenger locomotives, including well-known classes like the WAP-4, WAP-5 and WAP-7 that haul express trains across the country. Their distinctive horns became familiar through station recordings, cab ride footage and trainspotting videos shared online by railway enthusiasts. As those clips spread on video platforms, the short honk was isolated and reused as a standalone sound by editors who wanted an instantly recognisable Indian train moment without using a full departure scene.