Raymond, William Galt, 1859-1926, Raymond, William Galt, 1859-1926. cre · New York, J. Wiley & sons, inc · leaf 108
Fig. 35 line of the road. There are two general classes, stiff frogs andspring rail frogs. One ordinary form of stiff frog is shown inFig. 34, and in Fig. 35 the names of parts are given. There areseveral methods of construction. Figure 34 is a bolted frog; somefrogs are fastened together with… … clamped frogs; others havethe rails riveted to a thicksteel plate. Figure 36 isa spring rail frog. Themovable wing rail is heldagainst the frog point bysprings at S, thus givingcontinuous main track.The flange of a wheel ofa car taking the siding orcoming from the sidingthrows the spring rail…
Railroad engineering
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