The horn belongs to Iron Berger, a character from The Galaxy Railways, an anime series built around trains travelling between planets on a vast interstellar railway network. In the show, the horn functions as both a practical signal and a symbol of duty, discipline and the crew's journey across space. Fans have lifted the sound for edits and soundboards because it is instantly recognisable to viewers of the series and carries that railway atmosphere without needing dialogue. It remains in use for nostalgic anime edits, train content and dramatic scene transitions.