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The West Highland Railway was built to Fort William by Robert McAlpine & Sons with Simpson & Wilson as engineers. Robert McAlpine & Sons was headed by Sir Robert McAlpine, nicknamed "Concrete Bob" for his innovative use of mass concrete. Concrete was used due to the difficulty of working the hard schist in the area
The viaduct is built from mass concrete, and has 21 semicircular spans of 50 feet. It is the longest concrete railway bridge in Scotland at 416 yards, and crosses the River Finnan at a height of 100 feet. The West Highland Line carries a single track and the viaduct is 18 feet wide between the parapets. The viaduct is built on a curve of 792 feet.
The concrete used in the Glenfinnan Viaduct is mass concrete, which unlike reinforced concrete does not contain any metal reinforcement. It is formed by pouring concrete, typically using fine aggregate, into formwork, resulting in a material very strong in compression but weak in tension.
Glenfinnan Viaduct has been used as a location in several films and television series, including Ring of Bright Water, Charlotte Gray, Monarch of the Glen, Stone of Destiny, The Crown and four of the Harry Potter films. (Hogwarts Express,) After its appearance in Harry Potter, British Transport Police had to warn fans not to walk on the viaduct after a handful of near misses with trains had occurred. It is also featured in the 2018 videogame Forza Horizon 4.
The Glenfinnan Viaduct features on some Scottish banknotes. The 2007 series of notes issued by the Bank of Scotland depicts different bridges in Scotland as examples of Scottish engineering, and the £10 note features the Glenfinnan Viaduct.