A narrow-gauge railway is a railway with a track gauge narrower than 1,435 mm standard gauge. Most narrow-gauge railways are between 600 mm and 1,067 mm.
Comparison of standard gauge and three foot narrow gauge wheelsets
1556 woodcut from De re metallica, showing a narrow-gauge railway in a mine
An Electric Tilt Train in Queensland. Unlike other states in Australia which use different gauges, Queensland's network is made up of 3 ft 6 in (1,067 mm)-gauge track.
The 3 ft (914 mm) gauge Disneyland Railroad in California
Two foot and 600 mm gauge railways are narrow-gauge railways with track gauges of 2 ft and 600 mm, respectively. Railways with similar, less common track gauges, such as 1 ft 11+3⁄4 in and 1 ft 11+1⁄2
Narrow-gauge railway
…railway with a track gauge (distance between the rails) narrower than 1,435 mm (4 ft 8+1⁄2 in) standard gauge. Most narrow-gauge railways are between 600 mm (1 ft 11+5⁄8 in) and 1,067 mm (3 ft 6 in). Since narrow-gauge railways are usually built with tighter curves, smaller structure gauges, and lighter…
A BL 9.2-inch howitzer with shells lined up on the ground recently delivered from the trench railway in the foreground during World War I
The Chemins de fer du Calvados' Caen station in France
A steam outline Schöma diesel locomotive on the Pelion railway in Greece
The Groudle Glen Railway Sea Lion locomotive c. 1910 on the Isle of Man