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Class "Ws," Simple Superheated Tank Engine, 4-6-4 Type. For heavy suburban trains, and for working heavy gradients on North Island Main Trunk line. Built in New Zealand Government Railway Workshops. Diameter of coupled wheels, 4ft. 6in.; cylinders, 17in. by 26in.; working-pressure, 200lb. per square inch; tractive power, 22,250lb.; weight in working-trim, 64 tons.