. Cassier's magazine . ll per-mit; and the desired result is attainedby carrying the boiler on a framethat, as it were, bridges the spacebetween the two engine trucks, sothat it is quite clear of wheels andmechanism. The design is particu-larly suitable for narrow-gauge lines,and the dimensions of the engines by means of a ball-and-socket con-nection, so that it can take up an in-clined position on a curve when neces-sary; but the rear truck has a sim-ple pivot connection, together withside supports and bearing surfaces,the ball-and-socket arrangement notbeing necessary at both ends. The engin
. Cassier's magazine . ll per-mit; and the desired result is attainedby carrying the boiler on a framethat, as it were, bridges the spacebetween the two engine trucks, sothat it is quite clear of wheels andmechanism. The design is particu-larly suitable for narrow-gauge lines,and the dimensions of the engines by means of a ball-and-socket con-nection, so that it can take up an in-clined position on a curve when neces-sary; but the rear truck has a sim-ple pivot connection, together withside supports and bearing surfaces,the ball-and-socket arrangement notbeing necessary at both ends. The engine illustrated has beensupplied for the Darjeeling-HimalayaRailway or 2-foot gauge. The firstengine of this class was constructedfor the Tasmanian Railways, andfour others are now under construc-tion. They will be fitted withSchmidt superheaters. It will now be desirable to dealwith other designs to be noticed inclasses, and those with single drivingwheels will first receive attention. REMARKABLE LOCOMOTIVES OF 1910 107. FIG. 7. SINGLE-DRIVER LOCOMOTIVE WITH FIREBOX OF THE BELPAIRE TYPE. MESSRS. KERR, STUART & LTD. For about ten years no single-driver locomotives, except a fewsmall tank engines for rail-motor orlike traffic, have been constructed, sofar as the writer is aware, in anycountry; and for practical purposesthe single engine may be said tohave disappeared, although it mustbe remembered that in England, atany rate, there are large numbers ofsuch engines still doing good service,in some cases on really hard , the construction in 1910of four single-driver locomotives inconformity with the most advancedprinciples of locomotive design is amatter of more than passing interest. The builders are Messrs. Kerr,Stuart & Co., Ltd., and the engineshave been supplied to the order ofthe consulting engineer of the Shang-hai-Nanking Railway; but in theirconstruction something like a recordwas achieved by the builders, the first engine being ready for testingin stea
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