The bridge is 659 metres (2,162 ft) long and constructed in stone except for bricksoffits to the arches. It has 28 arches, each spanning 60 feet (18 m). The railway is carried 37 metres (121 ft) above the river level.
It was electrified in 1989, and between 1993 and 1996 it underwent significant repair work for the first time in a Railtrack project with some funding from English Heritage. In 2010, the bridge was fitted with colour-changing lights for its 160th anniversary.
^Bruce, George Barclay (1851). "Description of the Royal Border Bridge over the River Tweed, on the York, Newcastle and Berwick Railway". Minutes of Proceedings of the Institution of Civil Engineers10: 219–44.