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。

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For greater benefit, the railway freight requires operation of double-decked container trains, making the clearance under the railway overpass insufficient.

为了提升效益，铁路货运需要开行双层集装箱列车，而上跨铁路立交桥桥下净空不足。

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The causes to separation of freight car couplers in operation are analysed, and relevant preventative measures are put forward.

对运行中货车车钩分离的原因进行了分析，并提出了相应的防范措施。

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The backlog prompted the closure of the M20 between the Maidstone and Ashford turn-offs to allow for the complex operation to shift non-freight traffic off the motorway and onto the A20 to make room for the hundreds of lorries waiting to board ferries and trains for France.

BBC: M20 in Kent still disrupted by cross-channel backlog

Steam passenger Tube trains were last in operation in 1907, but steam locomotives hauled freight and engineers' trains until 1971.

BBC: London

Wednesday's operation was made more complicated because there was a depot for freight trains on one side of the site and houses on the other, Berger said.

CNN: Experts defuse unexploded WWII bomb in central Berlin