This clip is circulated online as a short soundboard sound tagged for Jevin and Kanz, rather than as a line from a well-known film or show, and its exact original recording is not widely documented. That ambiguity has not stopped it spreading, because a train horn is instantly recognisable and needs no context to land. Creators reuse it as a reusable reaction sound for entrances, arrivals and sudden reveals, and its short length makes it easy to drop into memes, edits and short-form videos without disrupting the pacing.