| 摘要 |
An improved frog is provided with an interchangeable insert for a railroad turnout, such as a frog or crossing. The frog has a new modular interchangeable insert, which permits easy changing of worn pieces in situ. The insert is a solid, unitary piece of high strength steel of two different geometrical shapes. An upper part of the insert is triangular in shape having a flat or planar base surface. A lower part of the insert is of a rectangular, planar sided member of box shape and serves as the web, running from the front to rear of and through the center and beneath the triangular upper part.
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