Class "X" Four-cylinder Balanced-compound Locomotive, 4-8-2 Type, specially designed for working heavy Gradients on North Island Main Trunk Railway. Building in New Zealand Government Railway Workshops. Gauge of Line: 3ft. 6in. Diameter of Coupled Wheels: 3ft. 9in. Cylinders: h.p., 13½in.; 1.p., 22in.; Stroke, 22in. Working Steam-pressure: 250lb. per square inch. Weight in working trim: 90tons (201,600lb.).