When a turnout is connected with CWR through welded joints, the longitudinal rail temperature force ACTS directly on the frog and the switch section along with the variation of rail temperature.

道岔与无缝线路焊接后，随着轨温的变化，长钢轨纵向温度力将直接作用于道岔的撤叉和转撤部分。

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It is very difficult to welding a high carbon steel rail and a high manganese steel frog, which is still a worldwide puzzle.

碳钢钢轨与高锰钢辙叉的焊接难度很大，仍属国际性难题。

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Free from bent and twisted rails, frog, switches, and guard rails, or rails with split rail.

不含任何弯曲或扭曲轨、道岔、转辙器及制动轨，或有裂口或破底钢轨。

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He knelt down and crawled from the switch rails to the frog of the crossover, sliding his hand along the running surface and the head of the rail and feeling for possible corrugations or dents, or burrs shaved off by the wheels of the locomotives.

NEWYORKER: Among Animals and Plants