. Railway track and track work . the crossing piece would hold thewheels over so that they cannot get on the wrong side of the main rail. Whenthe head of such a train reaches the switch, each set of wheels would open it,but this would not throw the frog, owing to a spring connection in the switchrod similar to that of the Lorenz switch (Fig. 54). The frog cannot move untilthe switch lever is unlocked and thrown. The Coughlin swing-rail frog is alsoon the same principle, but the lead wing rail does not move. The only movablepart is the frog piece or swing rail, which is made from an ordinary tr
. Railway track and track work . the crossing piece would hold thewheels over so that they cannot get on the wrong side of the main rail. Whenthe head of such a train reaches the switch, each set of wheels would open it,but this would not throw the frog, owing to a spring connection in the switchrod similar to that of the Lorenz switch (Fig. 54). The frog cannot move untilthe switch lever is unlocked and thrown. The Coughlin swing-rail frog is alsoon the same principle, but the lead wing rail does not move. The only movablepart is the frog piece or swing rail, which is made from an ordinary track railinstead of being a heavy casting. The end of this rail has the web and basecut away to let the head swing across the main rail, while the ends of the leadrail are riveted to a base plate which also supports the main rail, thus holdingthe parts in proper line and surface. The general design of these three devicesis shown in Fig. 62, and a similar arrangement is used with theWharton switch, already
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