. Cassier's magazine. lt en-gines of the 4-6-0 class came from theworks of Messrs. Sharp, Stewart & Co.,Glasgow, and I illustrate one of them,No. 369 (Fig. 8). It will be seen thatthe external design is more of the Brit-ish model than is that to which I havejust been referring; that is to say, it has a neater aspect to the British eye. Thesafety valves are placed in the steamdome, and the sand box is on the sideframe instead of being mounted on thetop of the boiler casing, with the ap-pearance of a second dome. But the chief difference between thetwo classes of engines, —both of whichare in th
. Cassier's magazine. lt en-gines of the 4-6-0 class came from theworks of Messrs. Sharp, Stewart & Co.,Glasgow, and I illustrate one of them,No. 369 (Fig. 8). It will be seen thatthe external design is more of the Brit-ish model than is that to which I havejust been referring; that is to say, it has a neater aspect to the British eye. Thesafety valves are placed in the steamdome, and the sand box is on the sideframe instead of being mounted on thetop of the boiler casing, with the ap-pearance of a second dome. But the chief difference between thetwo classes of engines, —both of whichare in the U division, the one beingdifferentiated as Ub and the othei 4Hh MM— —Ml 1 I W& _ _/eE**-- ,-Jmm*** |d ^s^Es^^i? * FIG. IE.—GOODS TANK LOCOMOTIVE FOR HEAW GRADIENTS, CLASS wd, BUILT AT THE BALDWIN LOCO-MOTIVE WORKS, PHILADELPHIA, U. S. A. CYLINDERS, 14 IN ; STROKE, 20 IN.; DIAMETER OF DRIVINGWHEELS, 3 FT. zK IN-; TRACTIVE POWER, 14 793 LBS.; TOTAL WEIGHT IN WORKING TRIM, 43% TONS 382 CASSIERS MAGAZINE. LOCOMOTIVE PRACTICE IN NEW ZEALAND 383 as Ua,—consists in the piston strokebeing lengthened by 2 inches in thelatter case, thus becoming 22 inches,and giving a material augmentation oftractive force, viz., to 115 pounds forevery pound of effective steam pressurein the cylinders. It will readily be per-ceived how the latest, or 0, typehas naturally and almost automaticallydeveloped itself out of this series of thesegradually expanding designs. The O engine certainly ought to fulfillall New Zealands main-line require-ments for some years to come. As regards the locomotives of thepurely goods type, for mainlineservice, their advance may be said tohave been along one single line of O and T classes of Ameri-can engine, with 15 x 18 cylindersand eight-coupled, 3-foot wheels and apony-truck, and the British P class,with 15 x 20 cylinders and eight-coupled, 3 foot 5-inch wheels, havecombined to evolve the newest B class, which is of the order known inAmerica as the M
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