The Cairngorm Mountain Railway, which opened in 2001, is the highest railway in the United Kingdom. The two-kilometre long funicular ascends the northern slopes of Cairn Gorm, the United Kingdom's seventh-highest mountain, serving the Cairngorm Mountain ski resort. The route and ski area are located within the Cairngorms National Park, the largest National Nature Reserve in Britain, located near Aviemore in the Highland area of Scotland.It is a Doppelmayr 120-SSB funicular railway. The railway closed in October 2018 due to structural issues and is due to reopen early in 2023.