Place it at the very start of a sequence as the announcement cue, then follow the action with a bell ding sound effect for a station detail, keeping other effects until after your main scene has begun rolling.
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This clip is a steam locomotive blowing its whistle, a sustained, piercing blast that lasts about twelve seconds. It gives a nostalgic yet urgent feeling, like a departure call that demands attention and signals something large and unstoppable is setting off into motion.