. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . ecomes extremely objectionable at high speeds,being mutually destructive to the rolling stock and to the jarring has been materially reduced by the device of springfrogs—to be described later. Frogs were originally made ofcast iron—then of cast iron with wearing parts of cast steel,which were fitted into suitable notches in the cast iron. Thisform proved extremely heavy and devoid of that elasticity oftrack which is necessary for the safety of rolling stock andtrack at
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . ecomes extremely objectionable at high speeds,being mutually destructive to the rolling stock and to the jarring has been materially reduced by the device of springfrogs—to be described later. Frogs were originally made ofcast iron—then of cast iron with wearing parts of cast steel,which were fitted into suitable notches in the cast iron. Thisform proved extremely heavy and devoid of that elasticity oftrack which is necessary for the safety of rolling stock andtrack at high speeds. The present standard practice is to buildthe frog up of pieces of rails which are cut or bent as are always four pieces for single-pointed frogs. Forheavy work they are assembled by bolting them together, theflangeways being provided by the use of fillers made of castiron, cast steel or rolled steel. For still heavier work the abovecombination is riveted to a base plate. For hght or street rail-way work, the rails are riveted to a base plate without using i fit ml *t n h ODJ ,) 1.
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