坑口
Route 91A, the first bus route serving Hang Hau Town, was introduced on 1 April 1976, serving between Hang Hau and Chuk Yuen (now known as Wong Tai Sin). After the city's Mass Transit Railway system commenced operation, the route was renamed 91M and truncated to Diamond Hill MTR station with effect from 16 December 1979; it was further curtailed to Choi Hung MTR station just 4 years later, on 3 November 1983. The Kowloon-side terminus of route 91M would return to Diamond Hill 14 years later, on 2 November 1997, this time to tie in with the opening of Diamond Hill Station Public Transport Interchange inside Plaza Hollywood shopping centre.