Engineering Wonders of the World
Volume I

LOCOMOTIVES OF UNUSUAL TYPE. 223 I-—A COMBINED RACK AND ADHESION LOCOMOTIVE, BUILT BY THE BALDWIN LOCOMOTIVE WORKS FOR THE SAN DOMINGO IMPROVEMENT COMPANY. It has six cylinders, lor driving the four-coupled adhesion wheels two pairs of Vauclain superposed cylinders, each oper- ating a common cross-head, are used. The other two cylinders, placed on top of these pairs, drive through lever gear the shaft of the leading wheels, on which is mounted a pinion engaging with the teeth of the rack rail laid between the running rails. By this means gradients much steeper than those negotiable by ordinary locomotives can be climbed. II. — A CRANE LOCOMOTIVE, BUILT BY MESSRS. HAWTHORN, LESLIE, AND CO., LTD. In engines of this type the crane is sometimes fitted upon the bunker, sometimes on a saddle topping the boiler (as in the example given above). The boiler supplies steam to small engines for lifting and swivelling the load. Raising is effected either by a movable jib, or by chains passing over a pulley at the end of a jib, which can move horizontally only, to a wind- ing drum. Many comparatively large engines of this kind are used by railway companies in their works, and f)r taking “ breakdown ” trains ; while private firms employ them for shunting and loading or unloading wagons on theii premises. The crane shown in the illustration lifts weights up to 4 tons with a jib that can be raised and lowered, and which, when not in use, rests upon the top of the chimney.