高架铁路：
1. aerialrail way; viaduct; overhead railway
2. elevated railway
3. suspension railway（磁悬浮铁路、列车）
4. sustained railway
例句：
1、These elevated-road schemes of his have eaten up too much capital.
他的这些高架铁路计划吃进了太多的资金。
2、The elevated railways are being replaced by buses and subways.
高架铁路正被公***汽车和地铁所取代。
3、Elevated Lines, LRT Systemand the Construction of a Transportation Centre
城市高架铁路、轻轨运输系统和客运枢纽建设
4、Key Points for Quality Control Supervision over Viaduct on Urban Light Rail Line
城市轻轨铁路高架桥监理质量控制重点