Responses of mast structure and overhead line equipment (OHLE) subjected to extreme events

At present, in modern railway systems, train or rolling stocks are powered by electricity through the overhead wire or the third rail on the ground. Overhead line equipment (OHLE) is the component for the electric train which supplies electric power to the train. OHLE is, for one or two tracks, normally supported by cantilever masts, while a portal frame structure supports OHLE for more than two tracks because of the requirement for more space. OHLE and its support, particularly cantilever mast, are the vulnerable components in a railway system because of their high slenderness and vibration sensitivity. This chapter presents the responses of the cantilever mast, OHLE, and its support under extreme events using finite element analysis (FEA). It is clear that OHLE failure could be observed because of the failure of the mast structure, particularly when the structure–support condition is poor (e.g., broken bolt, yielding weld, improper design and construction, and soft ground). The insight will increase the awareness of engineers for a better design of OHLE, mast structure, and its support condition to encounter natural disasters and future uncertainties. Moreover, the outcome will help civil and track engineers to effectively and efficiently inspect OHLE structures and their supports by using the structural responses.