Changes in product markets and logistics systems have increased the time value of freight transport.
商品市场和物流体系的变化增加了货物运输的时间价值。
These tiers could categorize methods of operation in conjunction with safety improvements such as separation of passenger and freight traffic and advanced train control systems.
这些安全措施包括将客运流量与货运流量隔离,升级列车控制系统等。
Fundamental elements and issues shaping traveler and freight transportation systems.
基本元素和问题形成旅客和船货运输系统。
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