spring-rail frog
noun
: 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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“Spring-rail frog.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/spring-rail%20frog. Accessed 28 Nov. 2024.
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