a section of double railroad tracks formed by the temporary convergence of two parallel tracks in such a way that each set remains independent while traversing the same ground,affording passage at a narrow place without need of switching

 
  • 套式铁轨,一段铁路轨道,其中两股道由于两条平行轨道暂时会聚而重叠,并使得每一股轨道都各有一根钢轨位于另一股轨道的两根钢轨之间,使得在狭窄的地方不需要换轨
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