Remarks: A brief glimpse of the cab controls of an 81 class working north west to Dubbo. Due to the rain I did not utilize dynamic brake, but instead relied on the air. The rollercoaster 1 in 40 (2.5%) grades inbetween Orange and Dubbo require a lot of powering and braking. BP pressure here is 500 kpa, (70 psi). A standard application being about 75 kpa (10 psi in the old money). I forget the train details, but such would probably have been an empty wheatie.