1874. Class "A." Cylinders, 8 in. by 15 in.; driv-ing-wheels, 30 in. ; tractivepower iat 75 per cent, boilerpressure), 2,856 lb. ; boilerpressure, 120 lb Weight in working-order, Hi tons.

1904. Class " Q,." Cylinders. 16in. by 22in.; driving - wheels. 49 in.; tractive - power (at 75 per cent, boi erpressure), 17.240 lb. ; boilerpressure, 200 lb Weight in working-order, 69 tons.

1).—2.

Evolution of the Locomotive Engine on the New Zealand Government Railways. Gauge, 3 ft. 6 in.