Korenix Switches Prevent Broadcast Storms and Enhance Network Interconnectivity in World's Longest Plateau Railway - Qinghai-Tibet Railway! The Qinghai-Tibet Railway, the highest plateau railway, is one of the most challenging railway line constructions in the world. Lying on frozen ground 3,000 meters above the sea level, the railway is subjected to extremely bad climacteric conditions: strong winds, heavy sandstorms, frequent thunderstorms, with more than a 30℃ temperature variation during the course of the day.