The clip was extracted from Trainz 2010 and Trainz 12, the long running train simulator series where players build routes and drive detailed locomotives. Its source is the Nathan AirChime P3, a real three bell air horn widely used on North American diesels from the mid twentieth century onward. In the games the horn is tied to player controlled signalling at crossings and stations. Fans ripped and shared the clean in game blast for use in other simulators, videos and soundboards, where its authentic chord remains popular with rail enthusiasts.