Depots are located at Kowloon Bay ( for Kwun Tong Line ) , Tsuen Wan ( for Tsuen Wan Line ) , Heng Fa Chuen ( for Island Line ) , and Dream City ( for Tseung Kwan O Line ) . Tung Chung Line , Airport Express , and Disneyland Resort Line trains are serviced at Siu Ho Wan between Tung Chung and Sunny Bay . All trains on the Kwun Tong Line , Tsuen Wan Line , Island Line , Tung Chung Line , Airport Express and Tseung Kwan O Line consist of eight cars .