International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 523
n that no bolts project through the bed-plates, necessitating the cutting of pockets in the crossingtimbers to receive the bolt heads, as increased decay is sureto follow. 1683. Replacing Frogs.—A replacing frog is a device for replacing derailed cars upon the track. Such afrog must combine… … Fig. 529. bar a slightly curved. The bar is bolted at one end to aheavy steel hook /; which hooks under the head of the rail.The joint r, connecting the bar and hook, allows the frog tobe placed in any desired position. The end ^ of the bar ishooked and pointed. In using the frog, the hook b is…
Railroad engineering
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