They prevent a train from entering a block unless it can leave it quickly.
除非列车可以快速通过，否则他们制止了列车的进入。
Research on the optimization model of the block container train formation plan;
本文主要讨论了装车地直达列车编组计划的优化问题。
Research on the optimization model of the block container train formation plan;
本文主要讨论了装车地直达列车编组计划的优化问题。
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