|Material||Stone and brick|
|Longest span||43 feet (13 m)|
|No. of spans||19|
|Clearance below||126 feet (38 m)|
|Opened||16 November 1863|
The railway was severely damaged by flooding during August 1948, with 7 bridges on the line failing, and the line closed to passenger traffic on 13 August 1948. Freight trains continued to run across the viaduct as far as Greenlaw until 19 July 1965.
The viaduct stands 126 feet (38 m) from the floor of the river valley. The arches, each of 43 feet (13 m) span, are of brickwork, and the abutments, piers and walls are of rustic-faced red sandstone. Some later strengthening of the abutments and piers with old rails and buttresses on the southern valley side is very obvious. It is straight over its whole course, and runs in a broadly northerly direction.
The viaduct is in good condition, having been renovated between 1992 and 1995. Repairs included replacement of masonry and brickwork, grouting, and underwater repair to one of the cutwaters.
It is near to the Roman settlement of Trimontium, which is to the south-west of the viaduct. To the east of the viaduct are the Drygrange Old Bridge, a road bridge dating from 1776, and its modern successor. This group of three bridges is sometimes known as Tripontium. To the east of the viaduct, the River Leader flows into the Tweed from the north.
- "Gordon Station". rcahms.gov.uk. Retrieved 15 March 2015.
- "Leaderfoot Viaduct". rcahms.gov.uk. Retrieved 15 March 2015.
- Benn, Jeremy (2013). "Railway bridge failure during flooding in the UK and Ireland" (PDF). Proceedings of the ICE - Forensic Engineering. 166 (4): 163–170. doi:10.1680/feng.2013.166.4.163. ISSN 2043-9903.
- "Braced for bungee battle at the bridge". The Herald. 8 March 1994. Retrieved 15 March 2015.
- "The Marlow Donkey" (PDF) (111). 2010: 17–18.
- "Leaderfoot Viaduct (Ref:15145)". historic-scotland.gov.uk. Retrieved 15 March 2015.
- Burman, Peter; Stratton, Michael (1997). Conserving the Railway Heritage. Taylor & Francis. pp. 217–218. ISBN 978-0-419-21280-5.
- "Historic Scotland aquires Borders viaduct". The Scotsman. 11 March 1996.
- Google (15 March 2015). "Leaderfoot Viaduct" (Map). Google Maps. Google. Retrieved 15 March 2015.
- Burman, Peter; Stratton, Michael (2014). Conserving the Railway Heritage. Taylor & Francis. p. 149. ISBN 978-1-136-74493-8.
- "Drygrange, Old Bridge". rcahms.gov.uk. Retrieved 15 March 2015.
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