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1. The engineer designed the crossover rail to improve the efficiency of the train's operation.
工程师设计了交叉轨道，以提高火车运行的效率。
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2. The construction of the crossover rail has been completed, and it will be used for testing the new safety system.
交叉轨道的施工已经完成，将用于测试新的安全系统。
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3. The crossover rail is a crucial component in the railway system, providing support for the train's movement.
交叉轨道是铁路系统中的关键部件，为列车的运动提供支撑。