Place it at the very start of a departure scene, before any dialogue or music, then follow it with station ambience and a crowd reaction to carry the journey forward.
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This clip is a steam locomotive whistle sounding three short blasts over about three and a half seconds, with the deep, airy tone of an old engine at a station. It feels nostalgic and expectant, like standing on a platform as a journey is about to begin, and it carries a cheerful sense of departure without feeling rushed.