The Biggest Little Railway in the World (BLR) was a temporary 71 mile (114 km) 1.25 inches (32 mm) O-gauge model railway from Fort William to the City of Inverness, the two largest settlements in the Scottish Highlands. It has been described as a crackpot project to run a model train the length of the Great Glen Way by an army of madcap enthusiasts, geeks, and engineers in the best spirit of eccentric Britishness.