Narrow-gauge railway
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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.
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
The 1 ft 11+1⁄2 in (597 mm) gauge Ffestiniog Railway in Wales
Minimum railway curve radius
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The minimum railway curve radius is the shortest allowable design radius for the centerline of railway tracks under a particular set of conditions. It has an important bearing on construction costs and operating costs and, in combination with superelevation in the case of train tracks, determines the maximum safe speed of a curve. The minimum radius of a curve is one parameter in the design of railway vehicles as well as trams; monorails and automated guideways are also subject to a minimum radius.
90-foot (27.43 m) radii on the elevated 4 ft 8+1⁄2 in (1,435 mm) standard gauge Chicago 'L'. There is no room for longer radii above this street intersection at this cross junction at the Wells and Lake street intersection in the northwest corner of the loop