FAIRLIE LOCOMOTIVES FOR NEW ZEALAND.
Engineering gives a perspective view of one of the six double- bogie Fairlie locomotives, constructed by the Avonside Engine Company, Bristol, England, forthe New Zealand Government Railways. The same journal also contains an engraving showing a longitudinal section and plan of this engine, with cross-sections, and a description of the same. We extract a few particulars :—": — " These engines are of the light - wheeled Fairlie type, they being carried on two four • wheeled bogies. The cylinders are 10 in. in diameter with 18 in. stroke, and the diameter of the coupled wheels being 3 ft. 3 in., the tractive force developed is 102 x 18 = 46 "15 lb. for each bogie, or 39 92 "3 together, for each pound of effective pressure per square in. on the pistons. With a mean effective cylinder pressure of 90 lbs. per in., the engine would thus develop a tractive force of 8307 lbs. There is relatively a large proportion of direct firebox heating serface to tube surface, and a large grate area, the engines being intended to work with peat fuel. The dimensions, in fact, clearly show the advantage possessed by the Fairlie system of enabling an ample size of grate to be obtained even on a narrow gauge without any attendant inconvenience. The chimneys are fitted with a spark - catching arrangement, while the blast nozzles are kept down close to the bottoms of the smoke-boxes, petticoat pipes being fitted above them. Ihe engine is provided with a brake applied to all the wheels, and is also fitted with the Le Ohatelier counterpressure brake arrangement. The weight of the engine is about 23 tons empty, ov about 28 tons in working ordef. " Fairlie engines are now at work in all parts of the world, and on a great variety of gauges, from 1 ft. Hi in. to 5 ft., and the experience gained in their construe* tion is plainly evident in the later designs. The Fairlie system has lived down its opponents, and its advantages are, we are glad to say, gradually becoming generally recognised, Of the power possessed by the Fairlie system of developing the carrying capacity of nar-row-gauge lines we have often spoken."
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FAIRLIE LOCOMOTIVES FOR NEW ZEALAND., Otago Witness, Issue 1273, 22 April 1876
FAIRLIE LOCOMOTIVES FOR NEW ZEALAND. Otago Witness, Issue 1273, 22 April 1876
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