Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 679
648 RAILROAD CARS. The action of the truck will be easily understood. When the car enters on a curve, thefront wheel, striking with its flange against the outer rail, will move the truck around its vertical 3606. … centre-line, bringing the four wheels into a convenient position on the curve; the tractive forcewhich acts on the front coupling of the car, and the resistance of the subsequent cars which acts on
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