The Tseung Kwan O Line is one of the eleven lines of the MTR system in Hong Kong. It runs from Hong Kong Island to the new town of Tseung Kwan O. The line is indicated with the colour purple. During the morning peak period, the Tseung Kwan O Line uses 15 trains to maintain a frequency of 2.7 minutes. The travel time of the entire line is 15 minutes.
This line was planned to serve the new town of Tseung Kwan O (literally, General's Bay) and was first proposed in 1985. The construction cost was estimated at three billion Hong Kong dollars,. The line was to be built beginning in 1992 and to open by the end of 1996. This plan was cancelled by the MTR Corporation in August 1990.
This is the first MTR line with no tracks on viaducts. The Yau Tong, Po Lam, and LOHAS Park stations are at the ground level, but are completely covered to minimise noise to the surrounding development. The rest of the line has its tracks underground.
Realignment of Kwun Tong Line upon the inauguration of Tseung Kwan O Line.
The line is served by K-Stock trains and, since 2013, C-Stock trains. The K-Stock trains were manufactured by a consortium of Hyundai Rotem and Mitsubishi Corporation, and were expected to be quieter and to use energy generated from deceleration. The C-Stock trains were Chinese built.
According to Rail Projects Under Planning 2000 released by Highways Department; in the North Island Line proposal, the Tseung Kwan O line will extend from North Point Station westwards to Tin Hau Station, and connect up with the western portion of the Island Line.