Let us watch one of the steam shovels at work. You will notice first that it requires two railroad tracks for its operation--the one on which it stands and one by the side on which are the flat cars it is to load. If the material in which it is to work is clay or sand, the shovel track is run close to the side of the hill to be cut away; otherwise the blasters will have preceded it and a great pile of broken rock lies by the side of the track or covering it before the shovel. Perched on a seat which revolves with the swinging arm a man guides the great steel jaws to the point of excavation. A tug at one lever and the jaws begin to bite into the clay, or root around in the rock pile until the toothed scoops have filled the great shovel that, closed, is rather bigger than a boarding house hall bedroom. A tug at another lever and they close. A third lever causes the arm to swing until it comes to a stop above the flat car, then with a roar and a clatter the whole load is dumped. Perhaps then the trouble is just beginning. Once in a while a boulder of irregular shape rolls about threatening to fall to the ground. With almost human intelligence the great rigid arm of the shovel follows it, checking it as it approaches the edge of the car, pushing it back, buttressing it with other stones, so that when the train gets under way it may by no chance fall off. Sometimes you see all this done from a point at which the directing man is invisible and the effect is uncanny. [Illustration: _Photo by Underwood & Underwood_ UNGAINLY MONSTERS OF STEEL WORKING WITH HUMAN SKILL] [Illustration: COPYRIGHT, 1913, BY F. E. WRIGHT THE CULEBRA CUT Dazzling colors combined with its colossal proportions make this man-made gash in nature’s eternal hills a magnificent spectacle. Its fullest glory will soon be dimmed, for the tropic jungle will cover its brilliant hues with a robe of green.]