Construction of world's tallest railway bridge begins in Manipur G uwahati: Construction of the world's tallest railway bridge from the point of pillar height has begun in Manipur by the Northeast Frontier Railway Construction Organisation. The proposed bridge near Noney with pillar height up to 141 metres is slated to become the tallest in the world from the point of pillar height surpassing the existing tallest of Mala-Rijeka viaduct on Belgrade-Bar railway line in Europe where the height of pillars is 139 metre, said an N-F Railway spokesman.