![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 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](https://c8.alamy.com/comp/2CGXTY0/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-itbut-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-2CGXTY0.jpg)
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
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Railway Switch & Crossings | How train change the track? | Introduction of Railroad Crossing - YouTube
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