The Far North Line is a rural railway line entirely within the Highland area of Scotland, extending from Inverness to Thurso and Wick. As the name suggests, it is the northernmost railway in the United Kingdom. The line is entirely single-track, with only passing loops at some intermediate stations allowing trains to pass each other. In common with other railway lines in the Highlands and northern Lowlands, it is not electrified and all trains are diesel-powered.

Thurso is a town and former burgh on the north coast of the Highland council area of Scotland. Situated in the historical County of Caithness, it is the northernmost town on the island of Great Britain. From a latitudinal standpoint, Thurso is located further north than the southernmost point of Norway and in addition lies more than 500 miles (800 km) north of London.