Minimum-gauge railway

The most common gauges for minimum-gauge railways include: These railways have been developed for applications such as estate transport, mining, agriculture, and amusement parks, offering an economical and adaptable solution for restricted environments.

Minimum-gauge railways allowed for ease of mobility on battlefields, mines, and other restricted environments.

A number of 18 in (457 mm) gauge railways were built in Britain to serve ammunition depots and other military facilities, particularly during the First World War.

In South Australia the Semaphore to Fort Glanville Conservation Park includes a steam engine service that runs on an 18 in (457 mm) track.

In France, Decauville produced a range of portable track railways running on 400 mm (15+3⁄4 in) and 500 mm (19+3⁄4 in) tracks, most commonly in restricted environments such as underground mine railways, parks and farms.