東區海底隧道
The G-Stock trains were built for the Eastern Harbour Crossing extension of the Kwun Tong line (became part of the Tseung Kwan O line in 2002), they were delivered from 1988 to 1989 and still serve on the Kwun Tong line. However, they moved to Tsuen Wan line starting from December 2017. They were the last batch of MTR M-Trains to be made by Metro-Cammell before being acquired by GEC-Alsthom in 1989.