spring-rail frog

noun

Definition of spring-rail frog

: a frog having a movable wing rail held against the point rail by springs and normally presenting an unbroken running surface to wheels using the main track but operating also to permit the passage of trailing wheels from a diverging track

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Cite this Entry

“Spring-rail frog.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/spring-rail%20frog. Accessed 20 Oct. 2020.

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