3 ft 6 in gauge railways

Railways with a track gauge of 3 ft 6 in (1,067 mm) were first constructed as horse-drawn wagonways.

The first intercity passenger railway to use 3 ft 6 in was constructed in Norway by Carl Abraham Pihl.

From the mid-nineteenth century, the 3 ft 6 in gauge became widespread in the British Empire.

It was adopted as a standard in New Zealand, South Africa, Indonesia, Japan, the Philippines, Taiwan, and Queensland (which has the second largest narrow gauge network in the world) in Australia.

There are approximately 112,000 kilometres (70,000 mi) of 1,067 mm gauge track in the world, which are classified as narrow-gauge railways.