I believe the bus you are talking abt is the MK2, the one that
is originally an NAC bus
Those buses, some are real jerky... Cos the bus captain thinks he
is driving the MK4 (The side destination plate that is rectangular
in appearance one) 
Those MK2 are supposed to be scrap already, has reached 17 years
old stat lifespan, but SBS asked for 2 yr extn