Input (grade 13): The entire Tung Chung Line and Airport Express, as well those stations added by the Tseung Kwan O Line, has platform screen doors (PSDs), ordered from Swiss glass door manufacturer Kaba Gilgen AG, installed upon construction.
Output (grade 11): Tung Chung Line, the Airport Express and Tseung Kwan O Line, except Quarry Bay station, had platform screen doors (PSDs) installed upon construction.