... switch position 开关位置 switch rails 侧线 switch register 开关寄存器 ...
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Switch and crossing rails 铁路道岔用非对称断面钢轨
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
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