| 摘要 |
A railroad trackwork frog assembly is provided with a base plate, a spring wing rail supported by and movable laterally relative to the base plate, and a hold-down subassembly attached to the spring wing rail and to the base plate, the hold-down subassembly comprising, in combination with a horn housing, a horn element having a cross-section area moment of inertia about a transverse horizontal axis intersecting the cross-section area center of gravity that is smaller than the cross-section area moment of inertia about a transverse vertical axis intersecting the cross-section area center of gravity.
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