TU2 is a Soviet narrow gauge diesel locomotive for the track gauge of 750 mm
TU2 pulls passenger train, narrow gauge railway in Rivne oblast, Ukraine, 2006
TU2-241 at the children's railway in Novomoskovsk, Russia
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