These new lines are suggested in the Second Railway Development Study (RDS-2) to provide direct links between the residential areas of Wah Fu and Ap Lei Chau in Southern District and the CBD of Hong Kong. Ces lignes sont suggérées dans la Second Railway Development Study (RDS-2) afin de fournir un lien direct entre les zones résidentielles de Wah Fu et de Ap Lei Chau et le Central business district de Hong Kong.
