How Chenab Railway Bridge Length Fluctuates with Seasons: Railway's Innovative Measures The world's tallest Railway Arch Bridge, known as the Chenab Bridge, was constructed over the Chenab River under the supervision of the USBRL. This bridge is constructed with a special type of metal, which causes its length to contract and expand with changes in temperature. Therefore, during the winter months, when temperatures drop, the bridge's length decreases, and in the summer, when temperatures rise, t