Some of them had their chassis damaged due to the fatigue caused during their service on the Tai Mo Shan KMB Route 51 , which climbed to the highest altitude achievable by buses in Hong Kong .
KMB started to withdraw its 2 - axle Metrobuses in 1997 .
Some of KMB had KMB 's chassis damaged due to the fatigue caused during their service on the Tai Mo Shan KMB Route 51 , which climbed to the highest altitude achievable by buses in Hong Kong .
KMB started to withdraw its 2 - axle Metrobuses in 1997 .