spring-rail frog

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• spring-rail frog — ˈ ̷ ̷ˌ ̷ ̷ 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… …   Useful english dictionary

• wing rail — noun : either of the two outside rails of a railroad frog of which both are rigid in a rigid frog and one is hinged in a spring rail frog * * * wing rail, (on a railroad track) an additional rail at a switch, laid so as to prevent the wheels from …   Useful english dictionary

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• Railroad switch — For other uses, see Switch (disambiguation). A right hand railroad switch with point indicator pointing to right …   Wikipedia

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