International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 517
a plate frog. The rails composing the frog are fastened to a plate of wroughtiron or steel a c d b by means of rivets through the railflanges, as shown in the figure. Square holes t\ f are 1100 TRACK WORK. punched in the plate to receive the railroad spikes, whichare driven into the cross-ties… … a b Fig. 626. suited to yard work where the curves are sharp and the frogangles correspondingly large. In this frog, the pieces of rails a and d, forming the point,are dovetailed together and secured by heavy rivets. Toretain the full strength and durability of the steel, all theparts are fitted…
Railroad engineering
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