铁路等级

对粤闽沿海铁路线路等级的探讨

Exploration of Grade of Designed Railways along Coastal Area of Guangdong and Fujian

应用研究表明：青云山铁路施工风险等级为四级，处于风险合理可降低区域。通过实施PRCA风险管理模式，二次评估时施工风险水平降为二级，效益显著。

Research shows that the construction risk for Qingyun mountain railway ranks at Grade IV which belongs to a reasonably degradable area . After applying the PRCA risk management pattern , the risk has been lowered to Grade II for the reassessment , and the results are significant .

国家已把铁路和高等级公路等交通干线建设作为实施西部大开发的重要举措，并已列入国家建设的优先领域。

Now the construction of railway and highway has been taken precedence over other national construction in west China .

铁路明洞行车安全等级的模糊评判

Fuzzy judgment on grade of driving safety for open cut tunnels