Tung Chung Line , the Airport Express and Tseung Kwan O Line , except Quarry Bay station , had platform screen doors ( PSDs ) installed upon construction .
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 .