Just west of Gordon railway station the line reached its summit at 176 meters above sea level, before descending as far as Earlston railway station.
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The viaduct was opened on 16 November 1863 to carry the Berwickshire Railway, which connected Reston (on the East Coast Main Line between Berwick-upon-Tweed and Edinburgh) with St Boswells (on the Edinburgh to Carlisle "Waverley Line"), via Duns and Greenlaw.
In 1865 the magnificent Leaderfoot Viaduct of nineteen arches was constructed for the St Boswells Junction to Reston section of the Berwickshire Railway, a line which closed in 1948.