Metro Gudok is Russian for metro horn, and this clip captures the distinctive warning sound used by subway trains as they prepare to depart. Rather than coming from a single film, show or viral moment, it belongs to the large family of everyday transit sounds shared on soundboards for editing and memes. Train horns are instantly recognisable across cities, which helps this short recording travel well beyond Russian-speaking audiences. Creators keep returning to it because it conveys movement, urgency and urban atmosphere in just a couple of seconds.