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。

youdao

Meanwhile, because the freight forwarding market is influenced by various kinds of factors, the market operation order of our country is substandard.

与此同时，由于货运代理市场受各种因素影响较大，我国的市场经营秩序不规范。

youdao

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。

youdao

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