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The door-closing signal is a two to three second long series of harsh, fast, very high-pitched beeps (sounds like "scree-scree-scree-scree-scree..."), followed by a simple live announcement of the next station by the train driver. Every few stations, a live warning is announced: "No smoking, drinking, eating, playing of radio or tape players allowed in all Metro vehicles and stations". The sequence and announcement wording is unchanged from the time the system opened in 1984.
