Engineering Wonders of the World
Volume I

204 ENGINEERING WONDERS OF THE WORLD. Fig. 23.—FOUR-CYLINDER COMPOUND “ PRAIRIE ” TYPE EXPRESS LOCOMOTIVE, ITALIAN STATE RAILWAYS. Cylinders, 14 inches and 23£ inches by 25 inches. Driving wheels, 6 feet. Heating surface, 2,615 square feet. Working pressure, 213 lbs. Weight of engine, 70 tons. All four cylinders drive the same axle. The term “Prairie” signifies that there are leading and trailing pairs of wheels besides six-coupled wheels. Fig. 24.—“ PACIFIC ” TYPE FOUR-CYLINDER COMPOUND LOCOMOTIVE, BADEN STATE RAILWAYS. Cylinders, 17 inches by 24| inches, and 26 inches by 26| inches. Driving wheels, 6 feet. Heating surface, 2,793 square feet. Working pressure, 227 lbs. Weight of engine, 85 tons. Built by the firm of J. A. Maffei of Munich. These huge engines are peculiar in that the stroke of the high and low pressure cylinders is not the same for both. The wedge-shaped cab and the wind-cutting shields also are interesting, though probably of small value, as a train suffers much more from a side than from a head wind. The “ wind-cutter ” engines so long characteristic of the Paris, Lyons, and Mediterranean Railway of France are now being discontinued. Note.—“Weight of engine” excludes in every case the weight of the tender, where such is used. [Thanks for assistance in illustrating “ Steam Locomotives of To-day ” are due to—The Great Western Railway Co.; the London and South-Western Railway Co.; the Caledonian Railway Co.; the Great Northern Railway Co.; the Great Eastern Railway Co.; the Great Central Railway Co.; the Ballycastle Railway Co. ; the London and North-Western Railway Co. ; the North-Eastern Railway Co. ; the American Locomotive Co. ; the Baldwin Locomotive Works; the North British Locomotive Coi]