used rail meaning in Chinese

废旧钢轨
旧钢轨

And i ve been able to do it without using rails
而且这么做的时候不需要使用rails ！
Our main activities include import of iron ore , used rail and heavy melting scrap ( hms )
主要的出口商品包括中国小商品，日用品，轻工业品。
Feeder service could be used more extensively so that a lower development density would be viable without undermining the objective of using rail as the principal mode of transport for the new development areas
应更广泛地使用接驳服务，这便可在符合以铁路为新发展区的主要交通工具的原则下，增加低密度发展的可行性。
Now , many inspecting departments of railway stations mainly use rail - inspect vehicle to detect rail problems . but the rail - inspect vehicle is expensive , rail stations can ’ nt equip enough numbers for each inspecting department
目前铁道检测部门主要采用铁轨检查车检测铁轨质量,但是铁轨检查车由于价格昂贵,各机务段配备的数量有限。