铁路工程英语常用词汇 铁路线 railway line ; railroad line 铁路网 railway network ; railroad network 铁道科学 railway science 铁路技术 railway technology 铁路等级 railway classification 国有铁路 national railway ; state railway 地方铁路 local railway ; regional railway 私有铁路 private railway 合资铁路 joint investment railway ; jointly owned railway 标准轨铁路 standard-gage railway 窄轨铁路 narrow-gage railway 米轨铁路 meter-gage railway 宽轨铁路