Castle Peak Bay
The southern extension mainly consists of a route linking On Ting and Ferry Pier, on the newly reclaimed land near the river mouth of Tuen Mun River, known as "Mouse Island" by locals. A short spur was also built from the extension to another terminus at Sam Shing Estate, located near Castle Peak Bay. Three LRT routes were diverted (route 505 was extended to Sam Shing) and one feeder bus route (route 559) discontinued as a result of these changes.