Victorian Railways Wagon Physic when they equiped air brakes on the older none airbrake wagons from 1890s onwards with a 6in diameter Combine Brake Cylinder, this physic has low slow speed friction but high friction at higher speeds.
Suitable for 4 Wheel Wagons such as M Cattle, I Timber, IA Steel, I Steel, Some IT Timber and KL Container Platform Wagons or wagons that have a mass of 6-8ton (Unloaded tare).
Brake Pipe: 72PSI Max
Brake Cylinder: 50PSI Max
Brake Type: 6in x 12in Combination
Brake Ratio: 19.1 Loaded, 61.2% Unloaded