. The development of the American rail and track . Fig. , Colliery Railroads of England, 1825. (From drawings in the U. S. National Museum.) Frogs of various shapes were used on the colliery roads of Englandprevious to the introduction of the locomotive. Fig. 133 is from a draw-ing in the collection, which was made from the report made by William. Fig. , Old Portage Railroad, about 1835. (From original in the U. S. National Museum.) Strickland in 1826 to the Pennsylvania Society for Internal Improve-ment, in which two types of frogs, which be examined while in Englandin 1825,
. The development of the American rail and track . Fig. , Colliery Railroads of England, 1825. (From drawings in the U. S. National Museum.) Frogs of various shapes were used on the colliery roads of Englandprevious to the introduction of the locomotive. Fig. 133 is from a draw-ing in the collection, which was made from the report made by William. Fig. , Old Portage Railroad, about 1835. (From original in the U. S. National Museum.) Strickland in 1826 to the Pennsylvania Society for Internal Improve-ment, in which two types of frogs, which be examined while in Englandin 1825, are illustrated and described. Fig. 134 is drawn from an old DEVELOPMENT OF THE AMERICAN KAIL AND TRACK. 707 frog (deposited in the collection) which was laid on the old PortageRailroad about 1835. It will be noticed that the casting at the end ofthe frog is designed to fit the Clarence [raH previously described. As the speed of trains increased, the cast-iron frog was found to beuusafe, and various forms of rail frogs were constructed. Fig. 135 is tyaudfo-RyhlhtmiTruck
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